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Rana EA, Nizami TA, Islam MS, Sarker S, Rahman H, Hoque A, Rahman M. Antimicrobial resistance and virulence profiling of Staphylococcus pseudintermedius isolated from cats, Bangladesh. Vet Q 2024; 44:1-11. [PMID: 38487883 PMCID: PMC10946260 DOI: 10.1080/01652176.2024.2326848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 02/29/2024] [Indexed: 03/19/2024] Open
Abstract
Staphylococcus pseudintermedius is a significant bacterial pathogen that frequently colonizes different body sites and mucous membranes of pets. The objectives of the cross-sectional study were to estimate the prevalence, antimicrobial resistance pattern, and detection of diverse resistance as well as virulence genes of S. pseudintermedius in cats. A standard bacteriological method, species-specific gene and different antimicrobial resistance as well as virulence genes were confirmed by PCR assay. A total of 233 swab samples were collected from different body sites of 102 cats, among them 146 swabs from 73 healthy cats, and 87 from 29 diseased cats. Overall, prevalence of S. pseudintermedius in cats was 12.01%, while dermatitis and otitis affected cats were 26.08% and 33.33%, respectively. The highest antimicrobial resistance was observed against penicillin (96.42%) followed by streptomycin (85.71%) and erythromycin (78.57%). Moreover, 89.28% of S. pseudintermedius isolates exhibit multi-drug resistance (MDR) (≥ 3 classes' antimicrobial resistant). In addition, 17.86% isolates harbored the mecA gene; thus, were classified as methicillin-resistant S. pseudintermedius (MRSP). Furthermore, the erythromycin resistance genes ermA and ermB were harbored by 25% and 10.71% of isolates, while 42.86% and 17.86% of isolates carried tetK and tetL (tetracycline resistance) genes, respectively. In virulence profiling, 32.14% (sea) and 10.71% (seb) of isolates were found positive for enterotoxin genes, whereas, the toxic shock syndrome toxin-1 (tst-1) gene and the Panton-Valentine leukocidin gene (pvl) were detected in 25% and 14.29% of isolates, respectively. To our knowledge, this is the first report of cats in Bangladesh for MDR S. pseudintermedius, MRSP, and their virulence profiling.
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Affiliation(s)
- Eaftekhar Ahmed Rana
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Tanvir Ahmad Nizami
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Md. Sayedul Islam
- Department of Microbiology and Public Health, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Subrata Sarker
- Department of Livestock Services, Ministry of Fisheries and Livestock, Dhaka, Bangladesh
| | - Hafizar Rahman
- Department of Pathology and Parasitology, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Azizul Hoque
- Department of Livestock Services, Ministry of Fisheries and Livestock, Dhaka, Bangladesh
| | - Mizanur Rahman
- Teaching & Training Pet Hospital and Research Center, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
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Agbo MC, Ezeonu IM, Onodagu BO, Ezeh CC, Ozioko CA, Emencheta SC. Antimicrobial resistance markers distribution in Staphylococcus aureus from Nsukka, Nigeria. BMC Infect Dis 2024; 24:320. [PMID: 38491352 PMCID: PMC10943768 DOI: 10.1186/s12879-024-09126-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Accepted: 02/12/2024] [Indexed: 03/18/2024] Open
Abstract
BACKGROUND Multidrug resistance in Staphylococcus aureus continues to influence treatment complications in clinical settings globally. Multidrug-resistant-S. aureus (MDR-SA) is often genetically driven by resistance markers transferable in pathogenic strains. This study aimed to determine the distribution of resistance markers in clinical isolates of S. aureus in Nsukka, Nigeria. METHODS A total of 154 clinical samples were cultured on mannitol salt agar. Isolates were characterized using conventional cultural techniques and confirmed by PCR detection of S. aureus-specific nuc gene. Antibiotic resistance profiles of the isolates were determined against selected antibiotics using the disk-diffusion method, while screening for antibiotic resistance genes (Mec A, Erm A, Erm B, Erm C, Van A, and Van B) was by PCR. RESULTS A total of 98 isolates were identified as S. aureus by conventional methods. Of these, 70 (71.43%) were confirmed by PCR. Phenotypically, the isolates exhibited high degrees of resistance to oxacillin (95.72%), erythromycin (81.63%), and ertapenem (78.57%) and 75.51% and 47.30% against methicillin and vancomycin, respectively. Multiple antibiotic resistance indexes of the isolates ranged from 0.3 to 1, and the most prevalent pattern of resistance was oxacillin-ertapenem-vancomycin-erythromycin-azithromycin-clarithromycin-ciprofloxacin- cefoxitin-amoxicillin-clavulanic acid. PCR screening confirmed the existence of various antibiotic resistance makers among the strains, with the most common resistance genes found in the isolates being Mec A (32.14%), Van A (21.43%), Van B (10.71%), Erm B (10.71%), and Erm C (17.86%). None possessed the Erm A gene. CONCLUSION The study supports the need for necessary action, including rational drug use, continuous surveillance, and deployment of adequate preventive and curative policies and actions.
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Affiliation(s)
- Martina C Agbo
- Department of Pharmaceutical Microbiology and Biotechnology, University of Nigeria, Nsukka, Nigeria.
| | - Ifeoma M Ezeonu
- Department of Microbiology, University of Nigeria, Nsukka, Nigeria
| | - Beatrice O Onodagu
- Microbiology Laboratory Unit, University of Nigeria Teaching Hospital, Enugu, Nigeria
| | | | - Chizoba A Ozioko
- Department of Pharmaceutical Microbiology and Biotechnology, University of Nigeria, Nsukka, Nigeria
| | - Stephen C Emencheta
- Department of Pharmaceutical Microbiology and Biotechnology, University of Nigeria, Nsukka, Nigeria.
- VBlab-Laboratory of Bacterial Viruses, University of Sorocaba, 18023-000, Sorocaba, SP, Brazil.
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Sheykhsaran E, Sadeghi J, Memar MY, Ghotaslou R, Baghi HB, Sharifi Y, Sefidan FY, Laghousi D, Abbasi A. Epidemiological characterization of clinical isolates of meticillin resistant Staphylococcus aureus through multilocus sequence typing and staphylococcal cassette chromosome mec typing in Northwest Iran. Mol Biol Rep 2024; 51:58. [PMID: 38165438 DOI: 10.1007/s11033-023-08951-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 11/07/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND Methicillin-resistant Staphylococcus aureus (MRSA), is considered a potential and aggressive nosocomial pathogen. It accounts for 50% of S. aureus isolates in tertiary hospitals in Iran, however, there is no sufficient evolutionary and epidemiological investigation about this medically important bacterium. We aimed to study the lineage and evolution of MRSA in Northwest Iran during 2021-2022 based on the obtained phenotypic and genotypic characteristics. MATERIALS AND METHODS Seventy-two non-duplicate MRSA isolates were collected from 3 referral hospitals in Tabriz, Ardebil, and Urmia cities. The antimicrobial susceptibility patterns were determined by disk diffusion test and micro broth dilution methods. Thereafter 4 virulence genes (eta, etb, pvl, tst) and 5 types of staphylococcal cassette chromosome mec (SCCmec) were detected by PCR. In the final step, representative isolates were selected to be studied by Multilocus sequence typing (MLST). RESULTS The highest resistance was observed to erythromycin and clindamycin at a rate of 76.4%, followed by ciprofloxacin (61.1%), gentamicin (54.2%), rifampin (38.9%), and co-trimoxazole (27.8%). All isolates were susceptible to vancomycin. The virulence genes of etb, pvl, tst, and eta were detected in 50%, 29.2%, 21.8%, and 13.9% of isolates, respectively. SCCmec types III and I were the most prevalent types, followed by types IV, II, and V. MLST analysis revealed 6 sequence types: ST6854, ST5282, ST127, ST7804, ST1607, and ST7784. Two MLST-based clonal complexes (CC8, and CC97) were identified as well. CONCLUSION The ST numbers were non-repetitive. CC8 as a pandemic clone and an individual lineage and clinically significant clade was reported as the most prevalent clonal complex. It is essential periodic evaluations of antibiotic susceptibility patterns and study the evolutionary characteristics of medical-challenging microorganisms in particular MRSA to effectively treat and restrict the outbreaks.
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Affiliation(s)
- Elham Sheykhsaran
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran
- Students' Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, PO Box 5165665931, Tabriz, Iran
| | - Javid Sadeghi
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran.
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, PO Box 5165665931, Tabriz, Iran.
| | - Mohammad Yousef Memar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Ghotaslou
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, PO Box 5165665931, Tabriz, Iran
| | - Hossein Bannazadeh Baghi
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, PO Box 5165665931, Tabriz, Iran
| | - Yaeghob Sharifi
- Department of Clinical Microbiology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Fatemeh Yeganeh Sefidan
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, PO Box 5165665931, Tabriz, Iran
| | - Delara Laghousi
- Social Determinants of Health Research Center, Health Management and Safety Promotion Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amin Abbasi
- Student Research Committee, Department of Food Sciences and Technology Research Institute, Faculty of Nutrition Sciences and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Asghar MU, Ain NU, Zaidi AH, Tariq M. Molecular distribution of biocide resistance genes and susceptibility to biocides among vancomycin resistant Staphylococcus aureus (VRSA) isolates from intensive care unit (ICU) of cardiac hospital- A first report from Pakistan. Heliyon 2023; 9:e22120. [PMID: 38046134 PMCID: PMC10686860 DOI: 10.1016/j.heliyon.2023.e22120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 11/01/2023] [Accepted: 11/05/2023] [Indexed: 12/05/2023] Open
Abstract
Background The study was conducted with the aim to investigate the VRSA isolates in terms of their susceptibility to routinely used biocides influenced by the co-occurrence of biocide resistant gene (BRGs) and efflux pumps genes. Methodology Frequently touched surfaces within intensive care unit (ICU) of cardiac hospital were classified into three primary sites i.e., structure, machines and miscellaneous. Over a period of six months (January 2021 to July 2021) twenty three swabs samples were collected from these sites. Subsequently, these samples underwent both phenotypic and molecular methods for VRSA isolation and identification. Susceptibility and efficacy testing of biocides (benzalkonium chloride (BAC), cetrimide (CET) and chlorhexidine gluconate (CHG)) were evaluated using microdilution broth and suspension method. Furthermore, specific primers were used for singleplex PCR targeting BRGs (cepA, qacA, and qacE) and efflux pump (norA, norB, norC, sepA, mepA and mdeA) associated genes. Results We found that 72.2 % S. aureus demonstrate the presence of vanA or vanB genes with no significant difference among three sites (p > 0.05). cepA is the most dominant BRGs followed by qacA and qacE from structure site as compared to other sites (p < 0.05). BAC showed reduced biocide susceptibility and MIC50. There was no significant difference between presence or absence of BRGs and high MIC values of VRSA isolates from all three sites. However, efflux pump genes (EFPGs) particularly norA and norA + sepA had a significant association with BRGs and reduced biocide. Conclusion BAC is the most effective disinfectant against VRSA. Proper and controlled use of BAC is required to overcome the VRSA contamination. We recommend continuous monitoring of the BRGs prevalence for better prevention of microorganism dissemination and infection control in hospitals.
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Affiliation(s)
- Muhammad Umer Asghar
- National Probiotic Lab, National Institute for Biotechnology and Genetic Engineering-College (NIBGE-C), Faisalabad, 38000, Pakistan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad, 45650, Pakistan
| | - Noor Ul Ain
- Institute of Microbiology and Molecular Genetics, University of the Punjab, Lahore, 54590, Pakistan
| | - Arsalan Haseeb Zaidi
- National Probiotic Lab, National Institute for Biotechnology and Genetic Engineering-College (NIBGE-C), Faisalabad, 38000, Pakistan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad, 45650, Pakistan
| | - Muhammad Tariq
- National Probiotic Lab, National Institute for Biotechnology and Genetic Engineering-College (NIBGE-C), Faisalabad, 38000, Pakistan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad, 45650, Pakistan
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Rasheed H, Ijaz M, Ahmed A, Javed MU, Shah SFA, Anwaar F. Discrepancies between phenotypic and genotypic identification methods of antibiotic resistant genes harboring Staphylococcusaureus. Microb Pathog 2023; 184:106342. [PMID: 37704062 DOI: 10.1016/j.micpath.2023.106342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 07/13/2023] [Accepted: 09/10/2023] [Indexed: 09/15/2023]
Abstract
Antimicrobial resistance is a global issue that limits therapeutic options for infections. S. aureus being a member of the ESKAPE group is capable of "escaping" the biocidal action of antimicrobial agents. There are phenotypic and genotypic methods used for the identification of antibiotic resistant genes harboring S. aureus but these methods do not always show concordant results. To address these discrepancies, a total of 335 equine nasal swab samples from four districts of Punjab were collected using a convenient sampling technique. These samples were first subjected to common microbial techniques to identify S. aureus. The disc diffusion assay was performed for the phenotypic identification of antibiotic resistant S. aureus by using discs of oxacillin, penicillin, vancomycin, gentamycin, and tetracycline. After this, PCR was performed by targeting mecA, blaZ, vanB, aaca-aphd, and tetK genes for genotypic identification of respective antibiotic-resistant S. aureus. Phenotypic discrepancies (number of antibiotic resistant isolates found from disc diffusion who appeared to be negative for the resistant gene), and genotypic discrepancies (number of antibiotic sensitive isolates found from disc diffusion who appeared to be positive for the resistant gene) were calculated. The discrepancy ratio for mecA, blaZ, vanB, aaca-aphd, and tetK genes were 3.09, 1.96, 2.67, 1.93, and 1.67 respectively. These discrepant results indicate that the absence or presence of only one gene is not a true marker of resistant or sensitive isolates. There are multiple resistance determinants and resistance mechanisms. This study also highlighted the phenomenon of silencing of antibiotic resistance determinants.
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Affiliation(s)
- Hamza Rasheed
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan
| | - Muhammad Ijaz
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan.
| | - Arslan Ahmed
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan
| | - Muhammad Umar Javed
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan
| | - Syed Faizan Ali Shah
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan
| | - Farwa Anwaar
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, 54000, Lahore, Pakistan
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Anwaar F, Ijaz M, Rasheed H, Shah SFA, Haider SAR, Sabir MJ. Evidence and Molecular Characterization of Multidrug Resistant Staphylococcus aureus Isolated From Equines in Pakistan. J Equine Vet Sci 2023; 126:104498. [PMID: 37088109 DOI: 10.1016/j.jevs.2023.104498] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/08/2023] [Accepted: 04/17/2023] [Indexed: 04/25/2023]
Abstract
The purpose of the current study was to investigate the nasal colonization and drug resistance profile of Staphylococcus aureus, methicillin-resistant S. aureus (MRSA), and vancomycin-resistant S. aureus (VRSA) in donkeys (n =63), mules (n = 42), and horses (n = 98). MRSA and VRSA were confirmed based on phenotypic and molecular methods, followed by phylogenetic analysis. Furthermore, the association of various animal and management-based risk factors with S. aureus colonization was also evaluated. The presence of nuc gene on polymerase chain reaction showed an overall prevalence of 42.86% of S. aureus in equines. Based on Kirby-Bauer disc diffusion test, 26.44% of isolates showed resistance to vancomycin. Further, mecA and vanB genes were targeted which showed an overall 14.94% and 13.79% prevalence of methicillin and vancomycin-resistant isolates, respectively. The phylogenetic analysis revealed a significant variation of the study isolates with each other and with already reported sequences of mecA and vanB genes. Risk factor analysis revealed that raising purpose (P = .011), work intensity (P < .001), stocking density (P = .006), presence of other livestock animals in surroundings (P = .043), and common drinking water source (P = .023) as significant. Antimicrobial susceptibility testing of MRSA and VRSA isolates showed high resistance to various commonly used antibiotics. Furthermore, all the tested isolates showing resistance to three or more than three antibiotics were considered multiple drug-resistant. The current study manifests the molecular evidence of MRSA and VRSA isolated from equines in Pakistan which will help to address the emerging issue of multidrug resistance in S. aureus in equines and emphasizes the need for possible measures to tackle this issue.
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Affiliation(s)
- Farwa Anwaar
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Muhammad Ijaz
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan.
| | - Hamza Rasheed
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Syed Faizan Ali Shah
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Syed Ali Raza Haider
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Muhammad Jawad Sabir
- Department of Veterinary Medicine, University of Veterinary and Animal Sciences, Lahore, Pakistan
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Ejaz M, Syed MA, Jackson CR, Sharif M, Faryal R. Epidemiology of Staphylococcus aureus Non-Susceptible to Vancomycin in South Asia. Antibiotics (Basel) 2023; 12:972. [PMID: 37370291 DOI: 10.3390/antibiotics12060972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 05/19/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
Staphylococcus aureus is one of the ESKAPE (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species) pathogens among which multidrug resistance has emerged. Resistance to methicillin has resulted in clinicians using the antibiotic of last resort, vancomycin, to treat infections caused by methicillin-resistant S. aureus (MRSA). However, excessive use and misuse of vancomycin are major causes of resistance among S. aureus strains. South Asia encompasses ~25% of the world's population, and countries in South Asia are often characterized as low- and middle-income with poor healthcare infrastructure that may contribute to the emergence of antibiotic resistance. Here, we briefly highlight the mechanism of vancomycin resistance, its emergence in S. aureus, and the molecular epidemiology of non-susceptible S. aureus to vancomycin in the South Asian region.
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Affiliation(s)
- Mohammad Ejaz
- Department of Microbiology, Government Postgraduate College Mandian Abbottabad, Abbottabad 22044, Pakistan
- Department of Microbiology, Qauid-i-Azam University, Islamabad 45320, Pakistan
| | - Muhammad Ali Syed
- Department of Microbiology, The University of Haripur, Haripur 22620, Pakistan
| | - Charlene R Jackson
- U.S. Department of Agriculture, Agricultural Research Service, U.S. National Poultry Research Center, Poultry Microbiological Safety and Processing Unit, Athens, GA 30605, USA
| | - Mehmoona Sharif
- Department of Microbiology, Qauid-i-Azam University, Islamabad 45320, Pakistan
| | - Rani Faryal
- Department of Microbiology, Qauid-i-Azam University, Islamabad 45320, Pakistan
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Navidinia M, Zamani S, Mohammadi A, Araghi S, Amini C, Pourhossein B, Goudarzi M. Hospital-Related Lineage of USA300 Methicillin-Resistant Staphylococcus aureus (MRSA) to Cause Bacteremia in Iran. BIOMED RESEARCH INTERNATIONAL 2023; 2023:8335385. [PMID: 37096227 PMCID: PMC10122600 DOI: 10.1155/2023/8335385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 03/28/2023] [Accepted: 04/06/2023] [Indexed: 04/26/2023]
Abstract
Staphylococcus aureus is an important pathogen that causes bloodstream infections. This study is aimed at assessing the genotypic characteristics of S. aureus strains responsible for bloodstream infections. An epidemiological study was conducted using 85 S. aureus strains isolated from bloodstream infections. Susceptibility was tested using the broth microdilution method and disk diffusion. All detected methicillin-resistant S. aureus (MRSA) isolates were confirmed by mecA PCR assays. S. aureus isolated from bacteremia were characterized using SCCmec, spa, and multilocus sequence typing methods. The prevalence of S. aureus strains responsible for bloodstream infections was 38.8%. All isolates were MRSA. Multidrug resistance (MDR) was present in 84.7% of isolates. MRSA isolated categorized within six clonal complexes including CC8 (60%), CC22 (22.4%), CC5 (5.9%), CC30 (4.7%), CC45 (4.7%), and CC59 (2.3%). The main lineages found were USA300/CC8-MRSA-IV/t008 (41.2%), followed by ST22-SCCmecIV/t790 (9.4%), ST239-SCCmecIII/t037 (7.1%), ST22-SCCmecIV/t032 (7.1%), ST239-SCCmecIII/t631 (5.9%), ST239-SCCmecIII/t860 (5.9%), ST22-SCCmecIV/t852 (5.9%), ST5-SCCmecIV/t002 (4.7%), ST45-SCCmecIV/t038 (4.7%), ST30-SCCmecIV/t318 (4.7%), ST59-SCCmecIV/t437 (2.3%), and ST225-SCCmecII/t045 (1.1%). Resistance to vancomycin amounted to 5.9% of isolates that belonged to ST239-SCCmecIII/t037 (80%) and ST8-SCCmecIV/t008 (20%). The emergence of USA300 strains in bloodstream infections in our country is a serious alarm and highlights the significant invasion of this lineage into the healthcare system. MDR patterns among these strains appear to be becoming the biggest problem in healthcare treatment.
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Affiliation(s)
- Masoumeh Navidinia
- Department of Medical Laboratory Sciences, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Samira Zamani
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Anis Mohammadi
- Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Shahram Araghi
- Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Chakameh Amini
- Department of Microbiology, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Behzad Pourhossein
- Pharmaceutical Sciences Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Goudarzi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Sami Awayid H, Qassim Mohammad S. Prevalence and Antibiotic Resistance Pattern of Methicillin-Resistant Staphylococcus aureus Isolated from Iraqi Hospitals. ARCHIVES OF RAZI INSTITUTE 2022; 77:1147-1156. [PMID: 36618304 PMCID: PMC9759256 DOI: 10.22092/ari.2022.357391.2031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 01/15/2022] [Indexed: 01/10/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) bacteria are often multi-drug resistant, resulting in a high rate of treatment failure. This study aimed to identify the antibiotics resistance profile and molecular characteristics of MRSA strains isolated from patients' samples, including skin, wounds, and burns, which are the most common infections, and collected from hospitals. The samples included 34 MRSA isolates gathered from January 2020 to September 2020. All isolates were tested using the Kirby-Bauer method to determine MRSA susceptibility against antibiotics using the minimum inhibitory concentration protocol and the E-test. The polymerase chain reaction was used for the detection of antibiotic resistance genes, including tetracycline, erythromycin, linezolid, gentamicin, rifampicin, ciprofloxacin, quinupristin-dalfopristin, clindamycin, and mecA. Staphylococcal Cassette Chromosome mec (SCCmec) was determined by multilocus sequence typing of all isolates; accordingly, the findings indicated that the sensitivity of linezolid, quinupristin-dalfopristin, rifampin, daptomycin, and vancomycin differed. Moreover, multidrug resistance of MRSA was shown to be more than 90% for penicillin and 91.1% for erythromycin. It was revealed that SCCmec III was resistant to at least four to five different antibiotics. ST585 (2.9%), ST240 (8.8%), ST45 (14.7%), ST22 (17.6%), and ST239 (higher rate) were the five sequence types found in STs (55.8%). Finally, it was indicated that the emergence of MRSA in these Iraqi hospitals highlighted further research to better understand how the infection might be effectively controlled.
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Affiliation(s)
- H Sami Awayid
- Institute of Technical, Middle Technical University, Suwaira, Iraq
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Inhibition of the Vancomycin Resistance in Staphylococcus aureus in Egypt Using Silver Nanoparticles. BIOMED RESEARCH INTERNATIONAL 2022; 2022:7380147. [PMID: 35535039 PMCID: PMC9078785 DOI: 10.1155/2022/7380147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 04/14/2022] [Accepted: 04/18/2022] [Indexed: 11/17/2022]
Abstract
Staphylococcus aureus is a major human pathogen that is sometimes resistant to vancomycin. In this study, the prevalence of vancomycin-resistant Staphylococcus aureus (VRSA) was studied. 100 isolates of S. aureus were identified based on biochemical and molecular evidence. The antibiotic susceptibility of the studied isolates was tested against 13 antibiotics by the disc diffusion method that showed 24 vancomycin-resistant isolates. The minimum inhibitory concentrations (MICs) were estimated by the agar dilution method to determine vancomycin intermediate-resistant S. aureus (VISA) and VRSA. The resistance gene cluster (vanA, vanR, vanH, and vanY) was amplified by PCR and then sequenced. Amplification of vanA and vanR genes showed that they are present in 21.4% and 14.3% of VRSA isolates, respectively, whereas none of the studied genes has been detected in VISA strains. A significant antimicrobial effect toward VRSA isolates using silver nanoparticles (AgNPs) synthesized from S. aureus and rosemary leaves was recorded. This study confirmed the existence of VRSA strains in Egypt. Furthermore, the use of silver nanoparticles inhibits these vancomycin-resistant S. aureus strains in vitro.
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Abd El-Hamid MI, Sewid AH, Samir M, Hegazy WAH, Bahnass MM, Mosbah RA, Ghaith DM, Khalifa E, Ramadan H, Alshareef WA, Alshareef HM, Ghoneim MM, Al-Sanea MM, Bendary MM. Clonal Diversity and Epidemiological Characteristics of ST239-MRSA Strains. Front Cell Infect Microbiol 2022; 12:782045. [PMID: 35402300 PMCID: PMC8990901 DOI: 10.3389/fcimb.2022.782045] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 02/16/2022] [Indexed: 12/14/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a major pathogen associated with severe morbidity and mortality and poses a significant threat to public health worldwide. The genetic diversity based on sequence types of MRSA strains was illustrated in previous studies; meanwhile, the diversity along with the predominant sequence type, especially in Egypt, remains unknown. The purpose of the current study was to determine the diversity of the predominant MRSA clone ST239-MRSA (n = 50) isolated from different hosts and clinical samples and to illustrate the correlation between the resistance patterns, toxin genes, and the genetic background in Port-said and El-Sharkia Governorates, Egypt. The ST239-MRSA clone was analyzed by phenotypic antibiotyping and various genotypic assays comprising SCCmec, agr, spa, coa, and coa-RFLP in addition to toxin gene profiles. Most of the analyzed strains (40/50, 80%) were multidrug resistant (MDR), belonged to SCCmec-III, agr-I, and coa genotype I, and harbored sea and pvl genes. A negative correlation between the toxin gene profiles and antimicrobial resistance was recorded. Meanwhile, the correlation between the toxin gene profiles and the genetic background was not observed in this study. Although ST239-MRSA strains belonged to a single sequence type, they exhibited a high degree of phenotypic and genotypic diversity, indicating weak clonality and adaptability. With such diversity, it is assumed that these strains may have undergone different evolutionary processes during transmission events among and/or within a single host or tissue niche.
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Affiliation(s)
- Marwa I Abd El-Hamid
- Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Alaa H Sewid
- Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Mohamed Samir
- Department of Zoonoses, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Wael A H Hegazy
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mosa M Bahnass
- Department of Animal Medicine (Infectious Disease), Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Rasha A Mosbah
- Fellow Pharmacist, Zagazig University Hospital, Zagazig, Egypt
| | - Doaa M Ghaith
- Department of Clinical and Chemical Pathology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Eman Khalifa
- Department of Microbiology, Faculty of Veterinary Medicine, Matrouh University, Matrouh, Egypt
| | - Hazem Ramadan
- Hygiene and Zoonoses Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Walaa A Alshareef
- Department of Microbiology, Faculty of Pharmacy, October 6 University, 6th of October, Egypt
| | - Hanan M Alshareef
- Department of Pharmacy Practice, Faculty of Pharmacy, University of Tabuk, Tabuk, Saudi Arabia
| | - Mohammed M Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, Al Maarefa University, Ad Diriyah, Saudi Arabia
| | - Mohammad M Al-Sanea
- Pharmaceutical Chemistry Department, College of Pharmacy, Jouf University, Sakaka, Saudi Arabia
| | - Mahmoud M Bendary
- Department of Microbiology and Immunology, Faculty of Pharmacy, Port Said University, Port Said, Egypt
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12
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New update on molecular diversity of clinical Staphylococcus aureus isolates in Iran: antimicrobial resistance, adhesion and virulence factors, biofilm formation and SCCmec typing. Mol Biol Rep 2022; 49:3099-3111. [PMID: 35064407 DOI: 10.1007/s11033-022-07140-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 01/10/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND Staphylococcus aureus is often considered as a potential pathogen and resistant to a wide range of antibiotics. The pathogenicity of this bacterium is due to the presence of multiple virulence factors and the ability to form biofilm. SCCmec types I, II and III are mainly attributed to HA-MRSA, while SCCmec types IV and V have usually been reported in CA-MRSA infections. METHODS AND RESULTS In this study, we performed a cross-sectional study to determine the antimicrobial resistance, adhesion and virulence factors, biofilm formation and SCCmec typing of clinical S. aureus isolates in Iran. S. aureus isolates were identified using microbiological standard methods and antibiotic susceptibility tests were performed as described by the Clinical and Laboratory Standards Institute (CLSI) guidelines. Inducible resistance phenotype and biofilm formation were determined using D-test and tissue culture plate methods, respectively. Multiplex-PCRs were performed to detect adhesion and virulence factors, antibiotic resistance genes, biofilm formation and SCCmec typing by specific primers. Among 143 clinical samples, 67.8% were identified as MRSA. All isolates were susceptible to vancomycin. The prevalence of cMLSB, iMLSB and MS phenotypes were 61.1%, 22.2% and 14.8%, respectively. The TCP method revealed that 71.3% of isolates were able to form biofilm. The predominant virulence and inducible resistance genes in both MRSA and MSSA isolates were related to sea and ermC respectively. SCCmec type III was the predominant type. CONCLUSIONS Data show the high prevalence rates of virulence elements among S. aureus isolates, especially MRSA strains. This result might be attributed to antibiotic pressure, facilitating clonal selection.
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Goudarzi M, Hajikhani B, Nasiri MJ, Goudarzi H, Dadashi M, Haghighi M, Hashemi A, Miri M. Emergence of CC8/ST239- SCCmec III/t421 tigecycline resistant and CC/ST22-SCCmec IV/t790 vancomycin resistant Staphylococcus aureus strains isolated from wound: A two-year multi-center study in Tehran, Iran. Acta Microbiol Immunol Hung 2021; 68:227-234. [PMID: 34806999 DOI: 10.1556/030.2021.01534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 11/05/2021] [Indexed: 11/19/2022]
Abstract
Staphylococcus aureus as an opportunistic bacterial pathogen with intrinsic and acquired resistance to many antibiotics is a worldwide problem. The current study was undertaken to evaluate the resistance pattern, and determine the genetic types of multidrug-resistant S. aureus isolated from wound. This cross-sectional study was conducted over the period of two years (from December 2018 to November 2020) at the hospitals affiliated to Shahid Beheshti University of Medical Sciences, Tehran, Iran. In present study, 75 multidrug-resistant S. aureus isolates collected from wound infections were investigated. Phenotypic resistance was assessed by Kirby-Bauer disk diffusion method. Conventional PCR was performed for the detection of virulence encoding genes. Genotyping of strains was performed based on coa gene polymorphism using multiplex-PCR assay. SCCmec typing, spa typing and MLST were also used to characterize the genotype of the mupirocin, tigecycline and vancomycin resistant multidrug-resistant S. aureus isolates. All 75 multidrug-resistant S. aureus isolates in the study were confirmed as MRSA. Coagulase typing distinguished isolates into five genotypic patterns including III (40%), I (24%), IVb (16%), V (10.7%) and type X (9.3%). Resistance to tigecycline was detected in 4% of MDR-MRSA isolates and all belonged to CC8/ST239- SCCmec III/t421 lineage. According to our analysis, one VRSA strain was identified that belonged to coa type V and CC/ST22-SCCmec IV/t790 lineage. Resistance to mupirocin was detected in 9.3% of strains. All 7 mupirocin resistant MDR-MRSA isolates exhibited resistance to mupirocin in high level. Of these, 4 isolates belonged to CC/ST8-SCCmec IV/t008 (57.1%), 2 isolates belonged to CC/ST8-SCCmec IV/t064 (28.6%) and one isolate to CC/ST22-SCCmec IV/t790 (14.3%). Altogether, current survey provides a snapshot of the characteristics of S. aureus strains isolated from patients. Our observations highlighted type III as predominant coa type among multidrug-resistant MDR strains indicating low heterogeneity of these isolates. Our study also indicates the importance of continuous monitoring of the genotypes of MDR-MRSA isolates to prevent nosocomial outbreaks and the spread of MDR isolates.
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Affiliation(s)
- Mehdi Goudarzi
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bahareh Hajikhani
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Javad Nasiri
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Goudarzi
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Masoud Dadashi
- 2 Department of Microbiology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Mehrdad Haghighi
- 3 Department of Infectious Diseases, Imam Hossein Teaching and Medical Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Hashemi
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mirmohammad Miri
- 4 Department of Critical Care and Anesthesiology, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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14
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Unni S, Siddiqui TJ, Bidaisee S. Reduced Susceptibility and Resistance to Vancomycin of Staphylococcus aureus: A Review of Global Incidence Patterns and Related Genetic Mechanisms. Cureus 2021; 13:e18925. [PMID: 34812309 PMCID: PMC8603868 DOI: 10.7759/cureus.18925] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2021] [Indexed: 11/23/2022] Open
Abstract
Staphylococcus aureus is a Gram-positive bacterium causing a wide range of infections ranging from cutaneous infections to endocarditis and bacteremia. Beta-lactamases such as penicillin and, subsequently, methicillin have been used in the treatment of S. aureus infections. With the emergence of methicillin-resistant Staphylococcus aureus (MRSA), vancomycin, a bacterial cell wall synthesis inhibitor, has been used as the treatment of choice for MRSA infections. However, over the past few decades, there have been reports of reduced susceptibility and resistance of S. aureus to vancomycin globally, most recently from Michigan, United States, in July 2021. Based on the minimum inhibitory concentration (MIC) of the antibiotic against S. aureus, there are three strains of resistance, vancomycin-intermediate Staphylococcus aureus (VISA), vancomycin-resistant Staphylococcus aureus (VRSA), and heterogeneous vancomycin-intermediate Staphylococcus aureus (hVISA). The increasing prevalence of VISA and VRSA infections is a cause of global concern. This qualitative review of peer-reviewed research publications aims to describe the cases of VISA and VRSA reported in the literature globally and summarizes the genetic mechanisms implicated in their resistance. The most common mechanism implicated in VRSA infections is the vanA operon, while cell wall thickening is responsible for VISA infections. This review aims to perform a global comparison between the MIC corresponding to the strength of resistance to vancomycin and the presence of the vanA operon. In this review, VISA and VRSA are noted to be most susceptible to quinupristin-dalfopristin and linezolid, respectively. Maintaining active systemic surveillance for such infections, employing strict infection control measures, and continuing to mitigate indiscriminate and irrational use of antibiotics are some of the actions that can be undertaken to reduce the incidence and transmission of VISA, VRSA, and hVISA infections worldwide.
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Affiliation(s)
- Susmita Unni
- Public Health, St. George's University, St. George's, GRD
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15
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Hernández-Aristizábal I, Ocampo-Ibáñez ID. Antimicrobial Peptides with Antibacterial Activity against Vancomycin-Resistant Staphylococcus aureus Strains: Classification, Structures, and Mechanisms of Action. Int J Mol Sci 2021; 22:7927. [PMID: 34360692 PMCID: PMC8347216 DOI: 10.3390/ijms22157927] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 07/15/2021] [Accepted: 07/19/2021] [Indexed: 12/27/2022] Open
Abstract
The emergence of bacteria resistant to conventional antibiotics is of great concern in modern medicine because it renders ineffectiveness of the current empirical antibiotic therapies. Infections caused by vancomycin-resistant Staphylococcus aureus (VRSA) and vancomycin-intermediate S. aureus (VISA) strains represent a serious threat to global health due to their considerable morbidity and mortality rates. Therefore, there is an urgent need of research and development of new antimicrobial alternatives against these bacteria. In this context, the use of antimicrobial peptides (AMPs) is considered a promising alternative therapeutic strategy to control resistant strains. Therefore, a wide number of natural, artificial, and synthetic AMPs have been evaluated against VRSA and VISA strains, with great potential for clinical application. In this regard, we aimed to present a comprehensive and systematic review of research findings on AMPs that have shown antibacterial activity against vancomycin-resistant and vancomycin-intermediate resistant strains and clinical isolates of S. aureus, discussing their classification and origin, physicochemical and structural characteristics, and possible action mechanisms. This is the first review that includes all peptides that have shown antibacterial activity against VRSA and VISA strains exclusively.
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Affiliation(s)
| | - Iván Darío Ocampo-Ibáñez
- Research Group of Microbiology, Industry and Environment, Faculty of Basic Sciences, Universidad Santiago de Cali, Cali 760035, Colombia;
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16
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Wu Q, Sabokroo N, Wang Y, Hashemian M, Karamollahi S, Kouhsari E. Systematic review and meta-analysis of the epidemiology of vancomycin-resistance Staphylococcus aureus isolates. Antimicrob Resist Infect Control 2021; 10:101. [PMID: 34193295 PMCID: PMC8247230 DOI: 10.1186/s13756-021-00967-y] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 06/03/2021] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Vancomycin‑resistant Staphylococcus aureus (VRSA) is a serious public health challenging concern worldwide. OBJECTIVES Therefore, the objective of present study of 62 published studies was to evaluate the prevalence of VRSA based on different years, areas, isolate source, antimicrobial susceptibility testing, and the genetic determinants. METHODS We searched the relevant articles that focused on the prevalence rates of VRSA in PubMed, Scopus, Embase, and Web of Science from 2000 to 2019. Statistical analyses were conducted using STATA software (version 14.0). RESULTS The prevalence of VRSA was 2% before 2006, 5% in 2006-2014, and 7% in 2015-2020 that showed a 3.5-fold increase in the frequency of VRSA between before 2006 and 2020 years. The prevalence of VRSA was 5% in Asia, 1% in Europe, 4% in America, 3% in South America, and 16% in Africa. The frequencies of VRSA isolated from clinical, non-clinical, and mixed samples were 6%, 7%, and 14%, respectively. The prevalence of VRSA was 12% using disk diffusion agar method, 7% using MIC-base methods, and 4% using mixed-methods. The prevalence of vanA, vanB, and vanC1 positive were 71%, 26%, and 4% among VRSA strains. The most prevalent genotype was staphylococcal cassette chromosomemec (SCCmec) II, which accounted for 57% of VRSA. The most prevalent staphylococcal protein A (spa) types were t002, t030, and t037. CONCLUSION The prevalence of VRSA has been increasing in recent years particularly in Africa/Asia than Europe/America. The most prevalent of genetic determinants associated with VRSA were vanA and SCCmec II. This study clarifies that the rigorous monitoring of definite antibiotic policy, regular surveillance/control of nosocomial-associated infections and intensive surveillance of vancomycin-resistance are required for preventing emergence and further spreading of VRSA.
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Affiliation(s)
- Qianxing Wu
- The Medical Lab of Hainan Cancer Hospital, Hainan Province, Haikou, 570312, People's Republic of China
| | - Niloofar Sabokroo
- Department of Microbiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Yujie Wang
- School of International Pharmaceutical Business, China Pharmaceutical University, Jiangsu Province, Nanjing, 211198, People's Republic of China.
| | - Marzieh Hashemian
- Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Somayeh Karamollahi
- Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Ebrahim Kouhsari
- Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, Iran.
- Department of Laboratory Sciences, Faculty of Paramedicine, Golestan University of Medical Sciences, Gorgan, Iran.
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17
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Bevalian P, Pashaei F, Akbari R, Pooshang Bagheri K. Eradication of vancomycin-resistant Staphylococcus aureus on a mouse model of third-degree burn infection by melittin: An antimicrobial peptide from bee venom. Toxicon 2021; 199:49-59. [PMID: 34087287 DOI: 10.1016/j.toxicon.2021.05.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 05/18/2021] [Accepted: 05/29/2021] [Indexed: 01/10/2023]
Abstract
Third-degree burn infections caused by antibiotic-resistant bacteria are of high clinical concern. Chemical antibiotics are not promising in eradication of bacterial infections. In this challenging condition, antimicrobial peptides (AMPs) are recently introduced as novel promising agents to overcome the issue. Accordingly, our study aimed to evaluate the efficiency of 'melittin' as natural peptide in bee venom, in eradicating vancomycin resistant Staphylococcus aureus (VRSA) on a mouse model of third-degree burn infection. In vitro pharmacological value of melittin was determined by examining its inhibitory and killing activities on VRSA isolates at different doses and time periods. The action mechanism of 'melittin' was evaluated by fluorescent release assay and Field Emission Scanning Electron Microscopy (FE-SEM) analyses. In vivo activity and toxicity of melittin were also examined on a mouse model of third-degree burn infection. The Minimum Inhibitory Concentration (MIC) and the Minimum Bactericidal Concentration (MBC) of melittin on all isolates ranged from '0.125-2 μg/mL' and '0.125-4 μg/mL', respectively. Rapid antibacterial activity of melittin on VRSA isolates was demonstrated by killing kinetics assays. Fluorometric and FE-SEM analyses indicated the membranolytic effects of melittin on VRSA isolates. The colonized VRSA bacteria were eradicated by melittin at 16 μg, in a single dose. No dermal toxicity and in vivo hemolysis were observed in the examined mice. The lack of in vivo toxicity of melittin along with its potent antibacterial activity indicated its promising therapeutic value as a topical drug against S. aureus associated third-degree burn infections.
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Affiliation(s)
- Parvaneh Bevalian
- Venom and Biotherapeutics Molecules Lab., Biotechnology Dept., Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Fatemeh Pashaei
- Venom and Biotherapeutics Molecules Lab., Biotechnology Dept., Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Reza Akbari
- Venom and Biotherapeutics Molecules Lab., Biotechnology Dept., Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran; Department of Microbiology, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, West Azerbaijan, Iran
| | - Kamran Pooshang Bagheri
- Venom and Biotherapeutics Molecules Lab., Biotechnology Dept., Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran.
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18
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Naimi HM, André C, Bes M, Tristan A, Gustave CA, Vandenesch F, Nazari QA, Laurent F, Dupieux C. Antibiotic resistance profile and molecular characterization of Staphylococcus aureus strains isolated in hospitals in Kabul, Afghanistan. Eur J Clin Microbiol Infect Dis 2021; 40:1029-1038. [PMID: 33389264 DOI: 10.1007/s10096-020-04130-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 12/14/2020] [Indexed: 11/24/2022]
Abstract
The aim of this study was to investigate the molecular features and the antibiotic resistance profile of 98 clinical Staphylococcus aureus isolates collected during 6 months in two hospitals of Kabul, Afghanistan. For all isolates, antimicrobial resistance patterns were determined by the disc diffusion method (including methicillin resistance which was detected using cefoxitin). The presence of the mecA/mecC genes was detected by PCR. Strains were then extensively characterized using microarray analysis. Of the 98 S. aureus isolates, methicillin-resistant S. aureus (MRSA) prevalence was high at 66.3%. Antibiotic susceptibility testing also revealed a high resistance rate to penicillin (100%), erythromycin (66.3%), ciprofloxacin (55.1%), and cotrimoxazole (40.8%). Resistance to tobramycin was detected in 25.5%, to gentamicin in 16.3%, to chloramphenicol in 34.7%, and to doxycycline in 23.5% of the isolates. All the MRSA isolates were mecA-positive and none of them harbored mecC. Isolates were grouped into twelve clonal complexes and twenty-seven distinct clones. The most frequently detected clones were the Southwest Pacific clone (CC30-MRSA-IV PVL+) (21/65 MRSA, 32.3%), the CC22-MRSA-IV TSST-1+ clone (11/65 MRSA, 16.9%), and the Bengal Bay clone (ST772-MRSA-V PVL+) (11/65 MRSA, 16.9%). The PVL genes were found in 59.2% (46/65 MRSA and 12/33 methicillin-susceptible S. aureus, MSSA) and tst1 gene in 16.3% of isolates. This molecular study highlights the high prevalence of MRSA and the large genetic diversity of the S. aureus isolates circulating and detected in two hospitals of Kabul, with the presence of multiple virulence and antibiotic resistance genes.
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Affiliation(s)
- Haji Mohammad Naimi
- Department of Microbiology, Faculty of Pharmacy, Kabul University, Kabul, Afghanistan.,CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France
| | - Camille André
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - Michèle Bes
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - Anne Tristan
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - Claude-Alexandre Gustave
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - François Vandenesch
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - Qand Agha Nazari
- Department of Microbiology, Faculty of Pharmacy, Kabul University, Kabul, Afghanistan
| | - Frédéric Laurent
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France.,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France.,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France
| | - Céline Dupieux
- CIRI - Centre International de Recherche en Infectiologie, Univ Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS UMR5308, ENS de Lyon, Lyon, France. .,Centre National de Référence des Staphylocoques, Institut des Agents Infectieux, Hospices Civils de Lyon, Lyon, France. .,Laboratoire de Bactériologie, Institut des Agents Infectieux, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France.
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Tayebi Z, Fazeli M, Hashemi A, Abdi S, Dadashi M, Nasiri MJ, Goudarzi M. Molecular characterization of invasive Staphylococcus aureus strains isolated from patients with diabetes in Iran: USA300 emerges as the major type. INFECTION GENETICS AND EVOLUTION 2020; 87:104679. [PMID: 33326876 DOI: 10.1016/j.meegid.2020.104679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 11/29/2020] [Accepted: 12/11/2020] [Indexed: 01/04/2023]
Abstract
There have been few studies focused on the molecular characterization of invasive Staphylococcus aureus strains in patients with diabetes in Iran. In the present study, 20 invasive S. aureus strains recovered from the patients with diabetes characterized by the virulence and resistance analysis, biofilm formation, staphylocoagulase (SC) typing, S. aureus protein A locus (spa) typing staphylococcal cassette chromosome mec (SCCmec) typing, and multilocus sequence typing (MLST). Virulence gene detection indicated a high prevalence of strains encoding the pvl genes (50%), a low prevalence of the tst and seg gene (each of them was 5%) and a markedly high prevalence of fnbB (95%), fnbA (85%), icaD (75%), icaA (65%). A total of 3 coagulase types (III, 85%; II, 10%; V, 5%), 2 agr types (I, 90%; II 10%) and 2 SCCmec types (IV, 65%; III, 35%) and four different clones namely ST8-MRSA-IV/t008 (50%) (USA300), ST239-MRSA-III/t030 (35%), ST5-MRSA-IV/t002 (10%), and ST45-MRSA-IV/t038 (5%) were detected in this study. Eighty-five percent of the isolates were biofilm producers. All the 4 high-level mupirocin resistance (HLMUPR) strains belonged to CC/ST8-MRSA-IV/t008 clone and carried mupA gene. Fusidic acid-resistant isolate belonged to ST239-SCCmec III/t030 clone. One vancomycin-intermediate resistance isolates was detected in our study, which belonged to ST5-MRSA-IVt002. Circulating clone in MRSA strains (USA300) isolated from the patients with diabetes highlighting the possibility of transmission of these microorganisms' clones between hospital, community, and environments. However, further studies require providing critical insights into the importance of continued controlling and treatment of S. aureus infections in patients with diabetes.
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Affiliation(s)
- Zahra Tayebi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Microbiology, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Maryam Fazeli
- Department of Virology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ali Hashemi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saeed Abdi
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Tehran, Iran
| | - Masoud Dadashi
- Department of Microbiology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Mohammad Javad Nasiri
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Goudarzi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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20
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Emergence and spread of coagulase type III and staphylococcal cassette chromosome mec type IV among mupirocin-resistant Staphylococcus aureus isolated from wound infections. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Elboshra MME, Hamedelnil YF, Moglad EH, Altayb HN. Prevalence and characterization of virulence genes among methicillin-resistant Staphylococcus aureus isolated from Sudanese patients in Khartoum state. New Microbes New Infect 2020; 38:100784. [PMID: 33194210 PMCID: PMC7642864 DOI: 10.1016/j.nmni.2020.100784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 10/06/2020] [Accepted: 10/09/2020] [Indexed: 12/27/2022] Open
Abstract
Staphylococcus aureus is a versatile pathogen that can cause a variety of diseases, ranging from mild to fatal infection. This study aimed to detect the virulence genes (cna, ica, hlg and sdrE) in S. aureus isolated from different types of infections in Sudanese patients admitted to different hospital in Khartoum state. This is a descriptive cross-sectional study conducted over a period of 4 months from 1 April to 30 July 2017 in Khartoum. Overall, 65 S. aureus isolates were identified using standard biochemical and microbiologic tests. Antibiotic susceptibility testing was performed using the Kirby-Bauer disc diffusion method. Nucleic acid was extracted using the guanidine hydrochloride method, and all the genes except for sdrE were detected by multiplex PCR. The ica gene was the predominant one, found in 73.85% of the isolates, with sdrE found in 38.46%, cna in 29.25% and hlg in 7.69%. The relationship between the virulence genes and resistance to antibiotics showed that the highest resistance was observed in isolates with ica and sdrE, followed by cna and hlg. There were significant relationships between methicillin resistance and the presence of sdrE and ica genes (p 0.01 for both) and between ciprofloxacin resistance and the presence of sdrE gene (p 0.03).
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Affiliation(s)
- M M E Elboshra
- Department of Medical Microbiology, College of Medical Laboratory Sciences, Sudan University for Science and Technology, Khartoum, Sudan
| | - Y F Hamedelnil
- Department of Medical Microbiology, College of Medical Laboratory Sciences, Sudan University for Science and Technology, Khartoum, Sudan
| | - E H Moglad
- Department of Pharmaceutics, College of Pharmacy, Prince Sattam bin Abdulaziz University, P.O.Box 173 Alkharj 11942.,Department of Microbiology, Medicinal and Aromatic Plants and Traditional Medicine Research Institute (MAPTMRI), National Center for Research, Khartoum, Sudan
| | - H N Altayb
- Biochemistry Department, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
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22
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Goudarzi H, Goudarzi M, Sabzehali F, Fazeli M, Salimi Chirani A. Genetic analysis of methicillin‐susceptible
Staphylococcus aureus
clinical isolates: High prevalence of multidrug‐resistant ST239 with strong biofilm‐production ability. J Clin Lab Anal 2020; 34:e23494. [PMID: 32696587 PMCID: PMC7676197 DOI: 10.1002/jcla.23494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 06/28/2020] [Accepted: 07/03/2020] [Indexed: 01/08/2023] Open
Abstract
Background The distributions of methicillin‐susceptible Staphylococcus aureus (MSSA) are divers geographically with different genetic backgrounds. Data related to molecular characteristics of MSSA compare to methicillin‐resistant Staphylococcus aureus (MRSA) is sparse. Methods In this cross‐sectional study, antimicrobial susceptibility testing, virulence genes analysis, biofilm formation, accessory gene regulator (agr) typing, and multilocus sequence typing (MLST) characterized on 75 MSSA isolates. Results Multidrug‐resistance MSSA was found to be 84%. Forty‐eight (64%) isolates were toxinogenic with 34 and 14 isolates carrying pvl and tst representing 45.3% and 18.7%. The most common SE genes were sed (20%), sec (16%), and sea (16%). Fifty‐five (73.3%) isolates were confirmed as biofilm producer with a markedly high prevalence of fnbA (93.3%), fnbB (86.7%), icaA (65.3%), icaD (53.3%), can (24%), ebp (10.7%), and bap (1.3%). A total of 3 agr types (I, 73.3%; III, 16%; II, 10.7%) and 4 clonal complexes (CCs) and sequence types (STs), namely CC8/ST293 (45.3%), CC/ST22 (28%), CC/ST30 (16%), and CC/ST5 (10.7%) were detected in this study. All the high and low‐level mupirocin resistance strains belonged to ST239 and ST22 strains, respectively. All the fusidic acid‐resistant isolates carried fusC and belonged to ST30. Conclusions These findings indicated that ST239 with strong biofilm production ability is the most common type in MSSA strains isolated from patients. It seems that the antimicrobial resistance profiles, toxin, and biofilm formation were closely associated with specific STs. Further studies are required to identify and control of these clonal lineages in our area.
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Affiliation(s)
- Hossein Goudarzi
- Department of Microbiology School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran
| | - Mehdi Goudarzi
- Department of Microbiology School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran
| | - Fattaneh Sabzehali
- Department of Microbiology School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran
| | - Maryam Fazeli
- Department of Virology Pasteur Institute of Iran Tehran Iran
| | - Alireza Salimi Chirani
- Department of Microbiology School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran
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23
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Esmaeili A, Salehi M, Makhdoomi N, H. Ardakani Y, Rajabi M, Namazi S. Evaluation of the Association between Trough and Area Under the Curve to Minimum Inhibitory Concentration Ratio (AUC24/MIC) of Vancomycin in Infected Patients with Methicillin Resistant Staphylococcus aureus (MRSA). PHARMACEUTICAL SCIENCES 2020. [DOI: 10.34172/ps.2020.70] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background: The recent studies emphasized on the correlation of vancomycin antibacterial effect with pharmacokinetics properties such as the area under the curve/minimum inhibitory concentration (AUC24/MIC) ≥400 and serum trough level 15-20 mg /L in the patients with severe infection with methicillin-resistant Staphylococcus aureus (MRSA). The purpose is to assay the vancomycin pharmacokinetic properties in our population and evaluates the correlation between AUC24/MIC and trough serum level of vancomycin in given patients. Methods: The patients with a positive MRSA culture, treated with vancomycin, were enrolled in this cross-sectional study. Three plasma samples were obtained during the study including 30 min before fourth and the fifth dose as trough levels and 1 hour after the fourth dose as peak level to determine AUC24. E-TEST determined the MIC of vancomycin. Results: Thirty-eight patients with an average age of 48.33±16.44 were enrolled in this study. The mean ± SD of MIC was 0.99±0.30 mg/L. Thirty-four patients reached the adequate therapeutic range of AUC24/MIC ≥ 400 due to the standard vancomycin dosing method. In comparison, only 7 and 10 patients had the first and second trough levels in target intervals of 15-20 mg/L, respectively. Due to the receiver operating characteristic curve test (ROC test), the trough level after the fourth dose had a strong correlation with target AUC24/MIC with a sensitivity of 94.1%and specificity of 75.0%. Conclusion: This study concluded using only a trough level is not appropriate for therapeutic drug monitoring (TDM) of vancomycin. In our population, target AUC24/MIC (≥ 400) had a reasonably strong correlation with the trough level before the fifth dose which achieved with trough level ≥10.81 mg/L and MIC< 1 mg/L.
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Affiliation(s)
- Ayda Esmaeili
- Clinical Pharmacy Department, Faculty of Pharmacy, Urmia University of Medical Sciences, Urmia, Iran
| | - Mohammadreza Salehi
- Department of Infectious Diseases and Tropical Medicines, Imam Khomeini Complex Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Nava Makhdoomi
- Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Yalda H. Ardakani
- Biopharmaceutics and Pharmacokinetic Division, Department of Pharmaceutics, School of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Mehdi Rajabi
- Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
- Department of Clinical Pharmacy, University Hospitals of North Midlands NHS Trust, United Kingdom
| | - Soha Namazi
- Clinical Pharmacy Department, Faculty of Pharmacy, Tehran University of Medical Sciences,Tehran, Iran
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24
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Zieliński W, Korzeniewska E, Harnisz M, Hubeny J, Buta M, Rolbiecki D. The prevalence of drug-resistant and virulent Staphylococcus spp. in a municipal wastewater treatment plant and their spread in the environment. ENVIRONMENT INTERNATIONAL 2020; 143:105914. [PMID: 32615351 DOI: 10.1016/j.envint.2020.105914] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/15/2020] [Accepted: 06/16/2020] [Indexed: 05/06/2023]
Abstract
Drug-resistant and pathogenic Staphylococcus spp. strains can reach surface waters and air with wastewater evacuated to the environment. These strains increase the environmental pool of genetic determinants conferring antibiotic resistance and virulence, and constitute a health risk for the employees of wastewater treatment plants (WWTP) who come into daily contact with bioaerosols. The aim of this study was to identify the genetic determinants of drug resistance and virulence in Staphylococcus spp. strains isolated from untreated (UWW) and treated wastewater (TWW), an activated sludge (AS) bioreactor, river water collected upstream and downstream from the wastewater discharge point (URW and DRW), and WWTP employees. All isolates were analysed for the presence of the rpoB gene, and were subjected to clonal analysis by ERIC fingerprinting. As a result, 249 of the 455 analysed isolates were selected for PCR. The presence of the gene encoding nuclease activity in S. aureus (nuc), the methicillin resistance gene (mecA), vancomycin resistance gene (vanA), antiseptic resistance gene (qacA/B) and virulence genes (sasX, pvl, tst1, hla, sec) was determined. The prevalence of nuc, mecA, vanA and qacA/B genes in wastewater and river water was determined by quantitative PCR (qPCR). In the group of strains isolated from wastewater and water samples, 63% were identified as S. aureus, and 20% of the strains carried the vanA gene. The hla virulence gene was present in 80% of the isolates, and the pvl gene was detected in 27% of the isolates. In the group of strains isolated from the employees, 82% were identified as S. aureus, and the presence of vanA and mecA genes was confirmed in 14% and 16% of the isolates, respectively. The most prevalent virulence gene was hla (74%), whereas pvl was observed in 43% of the isolates. The quantitative analysis revealed the highest concentrations of the studied genes in UWW samples, at 2.56x104 gene copies/ml for nuc, 1.18x103 gene copies /ml for mecA, 8.28x105 gene copies /ml for vanA and 3.83x105 gene copies /ml for qacA/B. Some of analysed genes were identified in the isolates from both URW and DRW samples, as well as in genomic DNA of these samples. These results indicate that wastewater is not effectively treated in the analysed WWTP, which could contribute to the dissemination of antibiotic resistance genes (ARGs) and antibiotic-resistant bacteria (ARB) to the environment. An analysis of the genetic relatedness of selected isolates revealed clusters of strains originating from UWW samples, AS samples and the employees. These observations suggest that ARGs and ARB are transmitted by wastewater bioaerosols to the upper respiratory tract mucosa of the plant's employees, thus increasing their exposure to infectious factors.
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Affiliation(s)
- Wiktor Zieliński
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland
| | - Ewa Korzeniewska
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland.
| | - Monika Harnisz
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland
| | - Jakub Hubeny
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland
| | - Martyna Buta
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland
| | - Damian Rolbiecki
- Department of Engineering of Water Protection and Environmental Microbiology, The Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-719 Olsztyn, Poland
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25
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Molecular Detection of Genes Involved in Biofilm Formation in Staphylococcus aureus Strains Isolates: Evidence From Shahid Motahari Hospital in Tehran. Jundishapur J Microbiol 2020. [DOI: 10.5812/jjm.102058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Infections caused by Staphylococcus aureus strains are a major public health challenge worldwide, especially in specialized burn hospitals. Infections caused by S. aureus account for more than 50% of burn-related deaths. Objectives: Since data on characteristics of these isolates are not sufficient, the current study aimed to assess the prevalence of resistance to antibacterial agents and to analyze the distribution of biofilm, and adhesion encoding genes among S. aureus strains isolated from burn patients in Motahari Hospital, Tehran, Iran. Methods: A total of 83 S. aureus strains were collected from burn wounds of patients admitted to a referral burn center in Tehran for 10 months. In vitro antibacterial susceptibility of isolates was evaluated using the Kirby-Bauer disk diffusion method. Strains were subjected to polymerase chain reaction (PCR) to determine the presence of nucA, mecA, ebps, cna, bbp, fnbA, fnbB, clfA, and clfB genes. Results: The highest frequency of resistance was found to cephalexin and cefoxitin (87.9%), followed by clindamycin (75.9%), erythromycin (72.3%), and ciprofloxacin (60.2%). Five resistance patterns were identified in which cephalexin, cefoxitin, clindamycin, erythromycin, and ciprofloxacin had the most predominant resistance profile (36.1%). Biofilm gene detection indicated a markedly high prevalence of cna (74.7%), clfB (54.2%), clfA (50.6%), fnbA (42.1%), ebp (13.2%), and fnbB (12%). Six different biofilm genetic patterns were identified, wherein clfA, clfB, fnbA, ebp, and cna (30.1%), clfA, clfB, fnbA, fnbB, ebp, and cna (12%), and clfA, clfB, and cna (8.4%) were the top three most frequently identified patterns. Conclusions: The prevalence of biofilm encoding genes, which are associated with multidrug resistance in S. aureus strains isolated from burn patients, is high. Therefore, identification of epidemiology, molecular characteristics, and biofilm management of S. aureus infection in burn units would be helpful.
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Naorem RS, Urban P, Goswami G, Fekete C. Characterization of methicillin-resistant Staphylococcus aureus through genomics approach. 3 Biotech 2020; 10:401. [PMID: 32864286 PMCID: PMC7441129 DOI: 10.1007/s13205-020-02387-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 08/10/2020] [Indexed: 01/09/2023] Open
Abstract
In the present study, a total of 35 S. aureus isolates collected from two different geographical locations viz., Germany and Hungary were tested for their methicillin-resistant phenotype which revealed a high incidence of methicillin-resistant S. aureus. The quantitative test for biofilm production revealed that 73.3% of isolates were biofilm producers. The isolates were further characterized using a set of biochemical and genotypic methods such as amplification and analysis of S. aureus species-specific sequence and mecA gene. The 33 mecA positive isolates were then characterized by the amplification of SCCmec and pvl toxin genes. Further, based on the biofilm-forming phenotype, 15 isolates were selected and characterized through PCR–RFLP of coa gene, polymorphism of spa gene and amplification of biofilm-associated genes. The dendrogram prepared from the results of both biochemical and genotypic analyses of the 15 isolates showed that except for the isolates SA G5 and SA H29, the rest of the isolates grouped themselves according to their locations. Thus, the two isolates were selected for further characterization through whole-genome sequencing. Comparative genome analysis revealed that SA G5 and SA H29 have 97.20% ANI values with 2344 gene clusters (core-genome) of which 16 genes were related to antibiotic resistance genes and 57 genes encode virulence factors. The highest numbers of singleton genes were found in SA H29 that encodes proteins for virulence, resistance, mobile elements, and lanthionine biosynthesis. The high-resolution phylogenetic trees generated based on shared proteins and SNPs revealed a clear difference between the two strains and can be useful in distinguishing closely related genomes. The present study demonstrated that the whole-genome sequence analysis technique is required to get a better insight into the MRSA strains which would be helpful in improving diagnostic investigations in real-time to improve patient care.
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Affiliation(s)
- Romen Singh Naorem
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Pécs, 7624 Hungary
| | - Peter Urban
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Pécs, 7624 Hungary
- Microbial Biotechnology Research Group, Szentágothai Research Centre, Pécs, 7624 Hungary
| | - Gunajit Goswami
- Department of Life Sciences, Dibrugarh University, Dibrugarh, 786004 Assam India
| | - Csaba Fekete
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Pécs, 7624 Hungary
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Shariati A, Dadashi M, Moghadam MT, van Belkum A, Yaslianifard S, Darban-Sarokhalil D. Global prevalence and distribution of vancomycin resistant, vancomycin intermediate and heterogeneously vancomycin intermediate Staphylococcus aureus clinical isolates: a systematic review and meta-analysis. Sci Rep 2020; 10:12689. [PMID: 32728110 PMCID: PMC7391782 DOI: 10.1038/s41598-020-69058-z] [Citation(s) in RCA: 121] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 06/15/2020] [Indexed: 12/22/2022] Open
Abstract
Vancomycin-resistant Staphylococcus aureus (VRSA), Vancomycin-intermediate S. aureus (VISA) and heterogeneous VISA (hVISA) are subject to vancomycin treatment failure. The aim of the present study was to determine their precise prevalence and investigate prevalence variability depending on different years and locations. Several international databases including Medline (PubMed), Embase and Web of Sciences were searched (data from 1997 to 2019) to identify studies that addressed the prevalence of VRSA, VISA and hVISA among human clinical isolates around the world. Subgroup analyses and meta-regression were conducted to indicate potential source of variation. Publication bias was assessed using Egger's test. Statistical analyses were conducted using STATA software (version 14.0). Data analysis showed that VRSA, VISA and hVISA isolates were reported in 23, 50 and 82 studies, with an overall prevalence of 1.5% among 5855 S. aureus isolates, 1.7% among 22,277 strains and 4.6% among 47,721 strains, respectively. The overall prevalence of VRSA, VISA, and hVISA before 2010 was 1.2%, 1.2%, and 4%, respectively, while their prevalence after this year has reached 2.4%, 4.3%, and 5.3%. The results of this study showed that the frequency of VRSA, VISA and hVISA after 2010 represent a 2.0, 3.6 and 1.3-fold increase over prior years. In a subgroup analysis of different strain origins, the highest frequency of VRSA (3.6%) and hVISA (5.2%) was encountered in the USA while VISA (2.1%) was more prevalent in Asia. Meta-regression analysis showed significant increasing of VISA prevalence in recent years (p value ≤ 0.05). Based on the results of case reports (which were not included in the calculations mentioned above), the numbers of VRSA, VISA and hVISA isolates were 12, 24 and 14, respectively, among different continents. Since the prevalence of VRSA, VISA and hVISA has been increasing in recent years (especially in the Asian and American continents), rigorous monitoring of vancomycin treatment, it's the therapeutic response and the definition of appropriate control guidelines depending on geographical regions is highly recommended and essential to prevent the further spread of vancomycin-resistant S. aureus.
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Affiliation(s)
- Aref Shariati
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Student Research Committee, Iran University of Medical Sciences, Tehran, Iran
| | - Masoud Dadashi
- Department of Microbiology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran.
- Non Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran.
| | - Majid Taati Moghadam
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Student Research Committee, Iran University of Medical Sciences, Tehran, Iran
| | - Alex van Belkum
- Open Innovation and Partnerships, Route de Port Michaud, 38390, La Balme Les Grottes, France
| | - Somayeh Yaslianifard
- Department of Microbiology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Davood Darban-Sarokhalil
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
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Khasawneh AI, Himsawi N, Abu-Raideh J, Salameh MA, Al-Tamimi M, Al Haj Mahmoud S, Saleh T. Status of Biofilm-Forming Genes among Jordanian Nasal Carriers of Methicillin-Sensitive and Methicillin-Resistant Staphylococcus aureus. IRANIAN BIOMEDICAL JOURNAL 2020; 24:386-98. [PMID: 32660224 PMCID: PMC7601545 DOI: 10.29252/ibj.24.6.381] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Introduction: Biofilm formation in Staphylococcusaureus is a major virulence factor. Both MSSA and MRSA are common causes of community- and hospital-acquired infections and are associated with biofilm formation. The status of biofilm-forming genes has not been explored in Jordanian nasal carriers of S. aureus. This study investigates antibiotic resistance patterns and the prevalence of biofilm-forming genes between MSSA and MRSA in two distinct populations in Jordan. Methods: A total of 35 MSSA and 22 MRSA isolates were recovered from hospitalized patients and medical students at Prince Hamzah Hospital, Jordan. Antibiotic susceptibility was tested using disk diffusion method and Vitek 2 system. The phenotypic biofilm formation was tested using CRA and microtiter plate assays. The prevalence of the biofilm-forming genes was determined using multiplex PCR. Results: Among 57 S.aureus isolates, 22 (38.6%) isolates were MRSA and were highly resistant against benzylpenicillin, oxacillin, and imipenem. The frequencies of the icaADBC were 77.1%, 97.1%, 94.3%, and 97.1% respectively in MSSA compared to 86.4%, 100%, 100%, and 100% in MRSA isolates. On the other hand, the frequency of the fnbA, fnbB, clfA, fib, clfB, ebps, eno, and cna genes was 81.8%, 90.9%, 95.5%, 90.9%, 86.4%, 100%, 100%, and 40.9%, respectively in the MRSA isolates. Conclusion: In both groups, MRSA isolates, in comparison to MSSA, were significantly more resistant to cefoxitin, oxacillin, imipenem, tetracycline, clindamycin, and trimethoprim-sulfamethoxazole. Unexpectedly, biofilm formation and gene prevalence between MRSA and MSSA isolates showed no significant difference, suggesting other potential virulence mechanisms.
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Affiliation(s)
- Ashraf I Khasawneh
- Department of Basic Medical Sciences, Faculty of Medicine, Hashemite University, Zarqa, Jordan
| | - Nisreen Himsawi
- Department of Basic Medical Sciences, Faculty of Medicine, Hashemite University, Zarqa, Jordan
| | - Jumana Abu-Raideh
- Department of Basic Medical Sciences, Faculty of Medicine, Hashemite University, Zarqa, Jordan
| | - Muna A Salameh
- Department of Basic Medical Sciences, College of Medicine, Al-Balqa' Applied University, Al-Salt, Jordan
| | - Mohammad Al-Tamimi
- Department of Basic Medical Sciences, Faculty of Medicine, Hashemite University, Zarqa, Jordan
| | - Sameer Al Haj Mahmoud
- Department of Basic Medical Sciences, College of Medicine, Al-Balqa' Applied University, Al-Salt, Jordan
| | - Tareq Saleh
- Department of Basic Medical Sciences, Faculty of Medicine, Hashemite University, Zarqa, Jordan
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29
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Single-nucleotide polymorphisms in a vancomycin-resistant Staphylococcus aureus strain based on whole-genome sequencing. Arch Microbiol 2020; 202:2255-2261. [PMID: 32535788 PMCID: PMC7455577 DOI: 10.1007/s00203-020-01906-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 02/02/2020] [Accepted: 05/11/2020] [Indexed: 01/04/2023]
Abstract
The emergence of vancomycin-resistant Staphylococcus aureus (VRSA) threatens global health. The mechanism of vancomycin resistance of VRSA without vanA gene acquisition was not fully elucidated. Therefore, we aimed to determine the mechanism of vancomycin resistance of VRSA besides that by vanA gene acquisition. In this study, we obtained vancomycin-resistant strains (V036-V64; MIC = 64 µg /ml) from susceptible strain (V036; MIC = 0.5 µg /ml) by exposure of vancomycin in vitro and examined the phenotypic characteristics and antibiotic susceptibility profiles of the resistant strain (V036-V64). To identify the genetic variations caused vancomycin resistance, we determined the complete genome sequences of V036 and V036-V64 and analyzed for single-nucleotide polymorphisms (SNPs) between two strains. Morphologically, V036-V64 had a twofold thicker cell wall compared with V036. Linezolid, rifampicin, and ceftaroline had similar MIC ranges against V036-V64 and V036, but V036-V64 showed lower susceptibilities to daptomycin and telavancin. We detected eight single-nucleotide polymorphisms differing between V036-V64 and V036: rimM (G16D), ssaA2 (G128A), rpsK (P60R), rpoB (R917C), walK (T492R), d-alanyl-d-alanine carboxypeptidase (L307I), vraT (A152V), and chromosome segregation ATPase (T440I). This study demonstrates that, under selective pressure, by the accumulation of mutations in genes related to cell wall synthesis, vancomycin-susceptible S. aureus can develop thicker cell walls and, hence, develop high vancomycin resistance. Thus, we highlight a novel vanA-negative mechanism for VRSA emergence.
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30
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Mansoorianfar M, Khataee A, Riahi Z, Shahin K, Asadnia M, Razmjou A, Hojjati-Najafabadi A, Mei C, Orooji Y, Li D. Scalable fabrication of tunable titanium nanotubes via sonoelectrochemical process for biomedical applications. ULTRASONICS SONOCHEMISTRY 2020; 64:104783. [PMID: 31937440 DOI: 10.1016/j.ultsonch.2019.104783] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/28/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
Titanium does not react well with the human tissues and due to its bio-inert nature the surface modification has yet to be well-studied. In this study, the sonoelectrochemical process has been carried out to generate TiO2 nanotube arrays on implantable Ti 6-4. All the prepared nanotubes fill with the vancomycin by immersion and electrophoresis method. Drug-releasing properties, antibacterial behavior, protein adsorption and cell attachment of drug-modified nanotubes are examined by UV-vis, flow cytometry, modified disc diffusion, BSA adsorption, and FESEM, respectively. The most uniform morphology, appropriate drug release, cell viability behavior and antibacterial properties can be achieved by samples anodized in the range of 60-75 V. Also improves the adsorption of BSA protein in bone healing and promotes osteoblast activity and osseointegration. Drug loading efficiency increases up to 60% via electrophoresis comparing the immersion method for anodized sample in 75 V. While electrophoresis does not affect the amount of vancomycin adsorption for lower voltages. Besides, the present study indicates that an anodized sample without drug loading has no antibacterial activity. Moreover, 28-days drug releasing from nanotubes is investigated by mathematical formula according to Fickian's law to find an effective dose of loaded drug.
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Affiliation(s)
- Mojtaba Mansoorianfar
- College of Materials Science and Engineering, Nanjing Forestry University, No. 159, Longpan Road, Nanjing, 210037 Jiangsu, PR China
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran; Department of Environmental Engineering, Gebze Technical University, 41400 Gebze, Turkey
| | - Zohreh Riahi
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | - Khashayar Shahin
- International Phage Research Center (IPRC), Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Mohsen Asadnia
- School of Engineering, Macquarie University, Sydney, Australia
| | - Amir Razmjou
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran; UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, Sydney, Australia
| | - Akbar Hojjati-Najafabadi
- Faculty of Materials, Metallurgy and Chemistry, School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China
| | - Changtong Mei
- College of Materials Science and Engineering, Nanjing Forestry University, No. 159, Longpan Road, Nanjing, 210037 Jiangsu, PR China
| | - Yasin Orooji
- College of Materials Science and Engineering, Nanjing Forestry University, No. 159, Longpan Road, Nanjing, 210037 Jiangsu, PR China.
| | - Dagang Li
- College of Materials Science and Engineering, Nanjing Forestry University, No. 159, Longpan Road, Nanjing, 210037 Jiangsu, PR China.
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Ibrahim YM, Abu El-Wafa WM. Evaluation of fosfomycin combined with vancomycin against vancomycin-resistant coagulase negative staphylococci. J Chemother 2020; 32:411-419. [DOI: 10.1080/1120009x.2020.1761638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Yasser Musa Ibrahim
- Department of Microbiology, General Division of Basic Medical Sciences, National Organization for Drug Control and Research (NODCAR), Giza, Egypt
| | - Wael Mohamed Abu El-Wafa
- Department of Microbiology, General Division of Basic Medical Sciences, National Organization for Drug Control and Research (NODCAR), Giza, Egypt
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Ahmadishoar S, Pour NK, Sadeghi J, Nahaei MR, Kheirkhah B. Genotypic and phenotypic characterisation of clinical isolates of methicillin-resistant Staphylococcus aureus in two different geographical locations of Iran. Indian J Med Microbiol 2020; 38:162-168. [PMID: 32883929 DOI: 10.4103/ijmm.ijmm_20_153] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background Methicillin-resistant Staphylococcus aureus (MRSA) has become more prevalent all over the world and it is important to determine MRSA prevalence and typing in different regions. The present study was carried out to determine the prevalence and frequency of circulating molecular types of MRSA isolates as well as their antibiotics susceptibility in Tabriz and Kerman cities of Iran. Materials and Methods A total of 230 S. aureus isolates were collected from Tabriz (n=125) and Kerman (n=105) during January to December 2018. MRSA isolates were identified by PCR amplification of nuc and mec A genes. Antibiotic susceptibility of MRSA isolates were determined by Kirby-Bauer disk diffusion method. Multiplex PCR was exploited to detect various types of SCCmec. Results The MRSA prevalence was 51/125 (40.8%) in Tabriz and 60/105 (57.1%) in Kerman. Overall, 36/51 (70.58%) and 15/51 (29.41%) isolates and 37/60 (61.66%) and 23/60 (38.34%) isolates were isolated from inpatients and outpatients in Tabriz and Kerman, respectively. Almost all of the isolates were resistant to penicillin and all of them were sensitive to linezolid. Thirty five (68.2%) and 34(56.6%) of MRSA isolates in Tabriz and Kerman were determined as MDR, respectively. SCCmec typing showed that the frequent SCCmec type in both Tabriz and Kerman cities was SCCmec III (56.86% and 55%, respectively). Conclusion The high prevalence of MRSA makes it necessary to revisit the antibiotics administration by physicians. Indeed, periodic evaluation of antibacterial susceptibility patterns of the MRSA strains is required for efficient treatment of MRSA infections.
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Affiliation(s)
- Shiva Ahmadishoar
- Department of Microbiology, Kerman Branch, Islamic Azad University, Kerman, Iran
| | - Nadia Kazemi Pour
- Department of Microbiology, Kerman Branch, Islamic Azad University, Kerman, Iran
| | - Javid Sadeghi
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Reza Nahaei
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Babak Kheirkhah
- Department of Microbiology, Kerman Branch, Islamic Azad University, Kerman, Iran
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Abstract
Staphylococci, and in particular Staphylococcus aureus, cause an extensive variety of infections in a range of hosts. The comprehensive analysis of staphylococcal genomes reveals mechanisms controlling the organism's biology, pathobiology, and dissemination. Whole-genome sequencing technologies led to a quantum leap in our understanding of bacterial genomes. The recent cost reduction of sequencing has resulted in unprecedented volumes of genomic information about S. aureus, one of the most sequenced bacterial species. Collecting, comparing, and interpreting big data is challenging, but fascinating insights have emerged. For example, it is becoming clearer which selective pressures staphylococci face in their habitats and which mechanisms allow this pathogen to adapt, survive, and spread. A key theme is the constant evolution of staphylococci as they alter their genome, exchange DNA, and adapt to new environments, leading to the emergence of increasingly successful, antibiotic-resistant, immune-evading, and host-adapted colonizers and pathogens. This article introduces the structure of staphylococcal genomes, details how genomes vary between strains, outlines the mechanisms of genetic variation, and describes the features of successful clones.
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Affiliation(s)
- Jodi A Lindsay
- St. George's, University of London, Institute of Infection and Immunity, London, United Kingdom
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Cong Y, Yang S, Rao X. Vancomycin resistant Staphylococcus aureus infections: A review of case updating and clinical features. J Adv Res 2019; 21:169-176. [PMID: 32071785 PMCID: PMC7015472 DOI: 10.1016/j.jare.2019.10.005] [Citation(s) in RCA: 197] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/02/2019] [Accepted: 10/09/2019] [Indexed: 01/08/2023] Open
Abstract
MRSA infection is a global threat to public health. Vancomycin is one of the first-line drugs for the treatment of MRSA infections. MRSA with complete resistance to vancomycin have emerged in recent years. The total number of VRSA isolates is updated in this paper. Resistance mechanisms, characteristics of VRSA infections, as well as clinical treatments are reviewed.
The infection caused by methicillin-resistant Staphylococcus aureus (MRSA) is a global threat to public health. Vancomycin remains one of the first-line drugs for the treatment of MRSA infections. However, S. aureus isolates with complete resistance to vancomycin have emerged in recent years. Vancomycin-resistant S. aureus (VRSA) is mediated by a vanA gene cluster, which is transferred from vancomycin-resistant enterococcus. Since the first VRSA isolate was recovered from Michigan, USA in 2002, 52 VRSA strains have been isolated worldwide. In this paper, we review the latest progresses in VRSA, highlighting its resistance mechanism, characteristics of VRSA infections, as well as clinical treatments.
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Affiliation(s)
- Yanguang Cong
- Department of Clinical Laboratory, Traditional Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Sijin Yang
- Department of Cardiovascular Disease, Traditional Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Xiancai Rao
- Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing 400038, China
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Razeghi M, Saffarian P, Goudarzi M. Incidence of inducible clindamycin resistance and antibacterial resistance genes variability in clinical Staphylococcus aureus strains: A two-year multicenter study in Tehran, Iran. GENE REPORTS 2019. [DOI: 10.1016/j.genrep.2019.100411] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Al-Amery K, Elhariri M, Elsayed A, El-Moghazy G, Elhelw R, El-Mahallawy H, El Hariri M, Hamza D. Vancomycin-resistant Staphylococcus aureus isolated from camel meat and slaughterhouse workers in Egypt. Antimicrob Resist Infect Control 2019; 8:129. [PMID: 31404199 PMCID: PMC6683426 DOI: 10.1186/s13756-019-0585-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 07/25/2019] [Indexed: 11/15/2022] Open
Abstract
Background The emergence of vancomycin-resistant Staphylococcus aureus (VRSA) represents a challenge for the treatment of staphylococcal infections in both human and animals worldwide. Although VRSA has been detected in several animal species worldwide, data on the bacterial prevalence in dromedary camels and workers in camel slaughterhouses are scarce. Methods We investigated meat samples from 200 dromedary camel carcasses from three different abattoirs that were being prepared to be sent to the markets. Twenty hand swabs were voluntarily collected from the workers in the same abattoirs. Isolation and identification of the bacterial specimens from the samples were performed using conventional cultural techniques and biochemical identification and were confirmed by PCR amplification of the nuc gene. Antimicrobial susceptibility against nine antimicrobial agents commonly used in human and camels was tested using the disc diffusion method, and genetic analysis was performed by evaluating the mecA gene in phenotypically oxacillin (OXA)- and cefoxitin (FOX)-resistant isolates. The resistance of S. aureus to vancomycin (VAN) was tested by broth microdilution and confirmed by PCR targeting the vanA and vanB genes. The vanA and vanB genes were sequenced. Result S. aureus was detected in both camel meat (29/200, 14.5%) and in abattoir workers (11/20, 55%). Of the collected samples, 27% (8/29, camel) and 54% (6/11, human) were identified as VRSA. All VRSA isolates carried both the vanA and vanB genes. Additionally, all VRSA isolates were also classified as methicillin-resistant S. aureus (MRSA). The vanA amplicons of the isolates from human and camel meat were homologous and clustered with a Chinese reference isolate sequence. Conclusion This study demonstrated that VRSA is present in camel abattoirs in Egypt. Zoonotic transmission between animals and human is probable and reflects both a public health threat and a food safety concern.
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Affiliation(s)
- Khaled Al-Amery
- 1Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, PO Box 12211, Cairo, Egypt
| | - Mahmoud Elhariri
- 1Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, PO Box 12211, Cairo, Egypt
| | - Alaa Elsayed
- 2Department of Food Safety and Biotechnology, Regional Center for Food and Feed, Agricultural Research Center, Giza, Egypt
| | - Gihan El-Moghazy
- 2Department of Food Safety and Biotechnology, Regional Center for Food and Feed, Agricultural Research Center, Giza, Egypt
| | - Rehab Elhelw
- 1Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, PO Box 12211, Cairo, Egypt
| | - Heba El-Mahallawy
- 3Department of Animal Hygiene, Zoonoses and Animal Behaviour and Management, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, 41522 Egypt
| | - Mohamed El Hariri
- 4Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Alazhar University, Cairo, Egypt
| | - Dalia Hamza
- 5Department of Zoonoses, Faculty of Veterinary Medicine, Cairo University, PO Box 12211, Giza, Cairo, Egypt
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Ziasistani M, Shakibaie MR, Kalantar-Neyestanaki D. Genetic characterization of two vancomycin-resistant Staphylococcus aureus isolates in Kerman, Iran. Infect Drug Resist 2019. [PMID: 31308707 DOI: 10.2147/idr.s205596]] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Aim The aim of this study was the genetic characterization of two clinical vancomycin-resistant Staphylococcus aureus (VRSA) isolates. Materials and methods Resistance to vancomycin was determined by phenotypic method. PCR was used for detection of mecA, vanA, ermA, ermB, ermC, msrA/B, aph(2")-Ic, aph(3')-IIIa, pvl, Immune Evasion Cluster [sea, sep, chip, sak and scn] genes and biofilm operon icaABCD. On the other hand, multilocus sequence typing and agr typing methods were performed for the determination of clonal relationship and van operon was detected and sequenced. Results Vancomycin-resistant Staphylococcus aureus strain 1 (VRSA-1) was positive for vanA, ermA, ermC, aph(2")-Ic, aph(3')-IIIa, sea, sep, icaD genes, belonging to agr type I; SCCmec type III; spa type t030; and ST239. However, the genetic characterization of Vancomycin-resistant Staphylococcus aureus strain 2 (VRSA-2) revealed the presence of various types of resistance genes vanA, ermA, ermC, aph(2")-Ic, aph(3')-IIIa, sea, icaD, relating to agr type I; SCCmec type III; spa type t459; and ST239. The presence of transposon Tn1546 was determined by PCR sequencing.The Basic Local Alignment Search Tool analysis of van operon in the VRSA isolates showed 99.6% sequence homology to Tn1546 in vancomycin-resistant enterococci, indicating the vanA operon has an enterococcal origin. Conclusion In conclusion, the ST239 is one of the most common clones of MRSA isolates which involved the hospital-associated infections, therefore, the emergence of VRSA isolates with ST239 increased the spread of resistance to vancomycin in the hospital settings.
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Affiliation(s)
- Mahsa Ziasistani
- Student Research Committee, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Pathology and Stem Cell Research Center٫ Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Reza Shakibaie
- Department of Microbiology and Virology, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Research Center for Infectious Diseases and Tropical Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Davood Kalantar-Neyestanaki
- Department of Microbiology and Virology, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
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Azmi K, Qrei W, Abdeen Z. Screening of genes encoding adhesion factors and biofilm production in methicillin resistant strains of Staphylococcus aureus isolated from Palestinian patients. BMC Genomics 2019; 20:578. [PMID: 31299899 PMCID: PMC6624993 DOI: 10.1186/s12864-019-5929-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 06/24/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Intercellular adhesion and biofilm production by Staphylococcus aureus makes these bacteria resistant to antimicrobial therapy. Here, Methicillin-resistant Staphylococcus aureus (MRSA) strains were characterized and the prevalence of genes encoding adhesion factors and biofilm formation was determined. RESULTS All 248 MRSA isolates identified by cefoxitin disc diffusion were positive for the mecA gene. SCCmec-IV was the most frequently detected genotype (92.7%) and SCCmec-IVa was also very prevalent (84.3%). The quantitative microtiter plate assay showed that all the isolates were able to produce biofilm with levels ranging from high (21%) to moderate (46.4%) to low (32.7%). All the strains possessed the icaD/icaA genes and produced biofilm (P < 0.05). None of the isolates possessed the bap gene. Furthermore, 94.8% of the isolates were positive for eno, 80.2% for clfA and for clfB, 78.2% for fnbA, 76.2% for ebps, 62.2% for fib, 39.9% for cna and 29.0% for fnbB. Also, nearly 69.8% of the isolates were positive for the gene sarA. All four agr groups were present: agr group 1 was predominant with 39.5%; agr group 3. agr group 2 and 3 strains carried more toxin-producing genes, and frequently produced more toxin. Sixty-six (26.6%) of the strains were multidrug resistant. All were vancomycin sensitive. Agr group I is more resistant to ciprofloxacin and gentamicin while agr group III is more resistant to erythromycin. Maximum sensitivity was to gentamicin and SXT, and they could be considered drugs of choice for controlling MRSA mediated infections in this region. CONCLUSIONS Biofilm development in MRSA might be an ica dependent and one needs to investigate the involvement of other global regulators, agr and sarA, and their contribution to the biofilm phenotype, as the high rate of biofilm production among the studied strains of S. aureus.
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Affiliation(s)
- Kifaya Azmi
- Biochemistry and Molecular Biology Department, Al-Quds Nutrition and Health Research Institute, Faculty of Medicine, Al-Quds University, Abu Deis, The West Bank, Palestine. .,Al-Quds Public Health Society, Jerusalem, Palestine. .,Faculty of Medicine, Al-Quds Nutrition and Health Research Institute, Al-Quds University, Abu-Deis, P.O. Box 20760, The West Bank, Palestine.
| | - Walaa Qrei
- Al-Quds Public Health Society, Jerusalem, Palestine
| | - Ziad Abdeen
- Al-Quds Public Health Society, Jerusalem, Palestine.,Faculty of Medicine, Al-Quds Nutrition and Health Research Institute, Al-Quds University, Abu-Deis, P.O. Box 20760, The West Bank, Palestine
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Ziasistani M, Shakibaie MR, Kalantar-Neyestanaki D. Genetic characterization of two vancomycin-resistant Staphylococcus aureus isolates in Kerman, Iran. Infect Drug Resist 2019; 12:1869-1875. [PMID: 31308707 PMCID: PMC6619737 DOI: 10.2147/idr.s205596] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 05/29/2019] [Indexed: 02/05/2023] Open
Abstract
Aim The aim of this study was the genetic characterization of two clinical vancomycin-resistant Staphylococcus aureus (VRSA) isolates. Materials and methods Resistance to vancomycin was determined by phenotypic method. PCR was used for detection of mecA, vanA, ermA, ermB, ermC, msrA/B, aph(2”)-Ic, aph(3ʹ)-IIIa, pvl, Immune Evasion Cluster [sea, sep, chip, sak and scn] genes and biofilm operon icaABCD. On the other hand, multilocus sequence typing and agr typing methods were performed for the determination of clonal relationship and van operon was detected and sequenced. Results Vancomycin-resistant Staphylococcus aureus strain 1 (VRSA-1) was positive for vanA, ermA, ermC, aph(2”)-Ic, aph(3ʹ)-IIIa, sea, sep, icaD genes, belonging to agr type I; SCCmec type III; spa type t030; and ST239. However, the genetic characterization of Vancomycin-resistant Staphylococcus aureus strain 2 (VRSA-2) revealed the presence of various types of resistance genes vanA, ermA, ermC, aph(2”)-Ic, aph(3ʹ)-IIIa, sea, icaD, relating to agr type I; SCCmec type III; spa type t459; and ST239. The presence of transposon Tn1546 was determined by PCR sequencing.The Basic Local Alignment Search Tool analysis of van operon in the VRSA isolates showed 99.6% sequence homology to Tn1546 in vancomycin-resistant enterococci, indicating the vanA operon has an enterococcal origin. Conclusion In conclusion, the ST239 is one of the most common clones of MRSA isolates which involved the hospital-associated infections, therefore, the emergence of VRSA isolates with ST239 increased the spread of resistance to vancomycin in the hospital settings.
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Affiliation(s)
- Mahsa Ziasistani
- Student Research Committee, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Pathology and Stem Cell Research Center٫ Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Reza Shakibaie
- Department of Microbiology and Virology, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Research Center for Infectious Diseases and Tropical Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Davood Kalantar-Neyestanaki
- Department of Microbiology and Virology, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
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Prevalence of vancomycin-intermediate Staphylococcus aureus among clinical isolates in Iran: A systematic review and meta-analysis. J Glob Antimicrob Resist 2018; 15:178-187. [DOI: 10.1016/j.jgar.2018.06.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 06/28/2018] [Accepted: 06/28/2018] [Indexed: 01/04/2023] Open
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Goudarzi M, Fazeli M, Eslami G, Pouriran R. Genetic Diversity Analysis of Mupirocin-Resistant Staphylococcus aureus Clinical Isolates in Tehran Hospitals, Iran. Microb Drug Resist 2018; 25:558-566. [PMID: 30499764 DOI: 10.1089/mdr.2018.0146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Few studies describe the molecular characterization of mupirocin resistance in Staphylococcus aureus strains. In this study, we evaluated the characteristics of mupirocin resistance in S. aureus isolates for 1-year period in Tehran, Iran. In a cross-sectional study, we collected 51 unique mupirocin-resistant strains obtained from 648 S. aureus isolates. High- and low-level resistance were determined by minimum inhibitory concentration with broth microdilution method. Presence of the genes for resistance to antibiotics and toxins was detected by polymerase chain reaction assays. Genotyping was performed by S. aureus protein A (spa) and staphylococcal cassette chromosome mec (SCCmec) typing, whereas clones were determined by multilocus sequence typing. Among mupirocin-resistant isolates, methicillin-resistant S. aureus (MRSA) 23 (45.1%) and 28 (54.9%) isolates were classified as high- and low-level mupirocin resistance, respectively. Among the 51 tested strains 25 (49%) isolates were positive for mupA genes. Seven different clones were detected in this study. High-level mupirocin-resistant (HLMUPR) strains belonged to ST8-SCCmec IV/t064 (n = 10, 19.6%), ST5-SCCmec IV/t002 (n = 5, 9.8%), ST8-SCCmec IV/t008 (n = 4, 7.8%), and ST239-SCCmec III/t631 (n = 4, 7.8%) clones, while low-level mupirocin-resistant (LLMUPR) strains belonged to ST22-SCCmec IV/t790 (n = 11, 21.6%), ST239-SCCmec III/t860 (n = 9, 17.7%), and ST15-SCCmec IV/t084 (n = 8, 15.7%) clones. Two strains belonged to ST22-SCCmec IV/t790 clone, despite carrying mupA gene, and demonstrated LLMUPR phenotype. One ST8-SCCmecIV/t008 strain with HLMUPR was confirmed as Vancomycin-intermediate S. aureus strain. Our data demonstrated the need for thorough epidemiological monitoring and a routine mupirocin testing program to prevent and detect mupirocin resistance in MRSA.
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Affiliation(s)
- Mehdi Goudarzi
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Fazeli
- 2 Department of Virology, Pasteur Institute of Iran, Tehran, Iran
| | - Gita Eslami
- 1 Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ramin Pouriran
- 3 School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Molecular Characterization of Vancomycin, Mupirocin and Antiseptic Resistant Staphylococcus aureus Strains. Mediterr J Hematol Infect Dis 2018; 10:e2018053. [PMID: 30210746 PMCID: PMC6131108 DOI: 10.4084/mjhid.2018.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 06/18/2018] [Indexed: 01/25/2023] Open
Abstract
Background Staphylococcus aureus is a common cause of nosocomial infections leading to a broad spectrum of diseases. Increasing antibiotic resistance among S. aureus strains, particularly methicillin-resistant S. aureus (MRSA), is a serious concern. In addition, the emergence of antiseptics resistance in MRSA helps the organism to persist and spread in healthcare environments easily. The aim of this study was to determine the molecular characteristics of vancomycin, mupirocin, and antiseptic resistant S. aureus strains. Materials and Methods This cross-sectional study was performed on a total of 120 MRSA isolates collected from two major hospitals in Shiraz, Iran. Minimum inhibitory concentrations (MICs) of vancomycin and mupirocin were determined by E-test method according to CLSI and Eucast guidelines. Presence of resistance genes was investigated by PCR method. Results Antibacterial susceptibility tests for MRSA isolates showed that three isolates (2.5%) were vancomycin-intermediate S. aureus (VISA), seven isolates (5.8%) were vancomycin-resistant S. aureus (VRSA), and 15 isolates (12.5%) were high-level mupirocin-resistant (MuH). None of the isolates had vancomycin resistance gene (vanA), but the frequency of mupirocin resistance gene was significant, and 55 (45.8%) isolates carried the mupA gene. Moreover, norA, smr and qacA/B genes were detected in 110 (91.7%), 55 (45.8%) and 36 (30%) strains, respectively. Conclusion This study showed the existence of VISA and VRSA strains in our region, and we also found a high frequency of mupirocin and biocide resistance genes among them.
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Kim HS, Hahn H, Kim J, Jang DM, Lee JY, Back JM, Im HN, Kim H, Han BW, Suh SW. Structural basis for the substrate recognition of peptidoglycan pentapeptides by Enterococcus faecalis VanY B. Int J Biol Macromol 2018; 119:335-344. [PMID: 30016658 DOI: 10.1016/j.ijbiomac.2018.07.081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/15/2018] [Accepted: 07/12/2018] [Indexed: 11/19/2022]
Abstract
Vancomycin resistance in Enterococci and its transfer to methicillin-resistant Staphylococcus aureus are challenging problems in health care institutions worldwide. High-level vancomycin resistance is conferred by acquiring either transposable elements of the VanA or VanB type. Enterococcus faecalis VanYB in the VanB-type operon is a d,d-carboxypeptidase that recognizes the peptidyl-d-Ala4-d-Ala5 extremity of peptidoglycan and hydrolyses the terminal d-Ala on the extracellular side of the cell wall, thereby increasing the level of glycopeptide antibiotics resistance. However, at the molecular level, it remains unclear how VanYB manipulates peptidoglycan peptides for vancomycin resistance. In this study, we have determined the crystal structures of E. faecalis VanYB in the d-Ala-d-Ala-bound, d-Ala-bound, and -unbound states. The interactions between VanYB and d-Ala-d-Ala observed in the crystal provide the molecular basis for the recognition of peptidoglycan substrates by VanYB. Moreover, comparisons with the related VanX and VanXY enzymes reveal distinct structural features of E. faecalis VanYB around the active-site cleft, thus shedding light on its unique substrate specificity. Our results could serve as the foundation for unravelling the molecular mechanism of vancomycin resistance and for developing novel antibiotics against the vancomycin-resistant Enterococcus species.
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Affiliation(s)
- Hyoun Sook Kim
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Republic of Korea; Therapeutic Target Discovery Branch, Division of Precision Medicine, National Cancer Center, Goyang, Gyeonggi, Republic of Korea; Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea.
| | - Hyunggu Hahn
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Jieun Kim
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
| | - Dong Man Jang
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Ji Yeon Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Jang Mi Back
- Therapeutic Target Discovery Branch, Division of Precision Medicine, National Cancer Center, Goyang, Gyeonggi, Republic of Korea
| | - Ha Na Im
- Therapeutic Target Discovery Branch, Division of Precision Medicine, National Cancer Center, Goyang, Gyeonggi, Republic of Korea
| | - Haelee Kim
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Byung Woo Han
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Republic of Korea.
| | - Se Won Suh
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea.
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Goudarzi M, Navidinia M, Beiranvand E, Goudarzi H. Phenotypic and Molecular Characterization of Methicillin-Resistant Staphylococcus aureus Clones Carrying the Panton-Valentine Leukocidin Genes Disseminating in Iranian Hospitals. Microb Drug Resist 2018; 24:1543-1551. [PMID: 29894277 DOI: 10.1089/mdr.2018.0033] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
Abstract
The spread of Panton-Valentine leukocidin (PVL)-carrying Staphylococcus aureus strains in both hospital and the community is a significant worldwide problem. The aim of the study was to investigate the clonal dissemination pattern of PVL-producing S. aureus strains isolated from hospitalized patients in Tehran, Iran. In this cross-sectional study, 70 PVL-carrying S. aureus strains were recovered from 240 clinical specimens and characterized by antibiotic susceptibility testing, agr typing, SCCmec typing, spa typing, multilocus sequence typing, and virulence and adhesion gene profiling. All the PVL-carrying S. aureus strains were confirmed as methicillin-resistant S. aureus (MRSA) and recovered from wounds (48.6%), blood (25.7%), exudate/pus (11.4%), sputum (8.6%), and body fluid (5.7%) samples. Among the 70 PVL-carrying S. aureus strains tested, 38 (54.3%) were positive for ant (4')-Ia gene, 27 (38.6%) for aac (6')-Ie/aph (2″), 13 (18.6%) for msr(A), 13 (18.6%) for erm(C), 13 (18.6%) for tet(M), 11 (15.7%) for erm(A), 10(14.3%) for msr(B), 9 (12.9%) for aph (3')-IIIa, 5 (7.1%) for mupA, and 2 (2.9%) for erm(B) genes. Five clonal complexes (CC) and nine different clones were detected in this study. The most frequent CC was CC22 (ST22) (42.8%) followed by CC30 (ST30) (21.5%), CC8 (ST8) (17.2%), CC1 (ST772) (11.4%), and CC80 (ST80) (7.1%). In this study, ST22-SCCmec IV/t852 was the predominant PVL-positive MRSA clone (20%), followed by ST8-SCCmec IV/t008 (17.2%), ST30-SCCmec IV/t019 (12.9%), ST22-SCCmec IV/t790 (11.4%), ST22-SCCmec IV/t005 (11.4%), ST30-SCCmec IV/t021 (8.6%), ST80-SCCmec IV/t044 (7.1%), ST772-SCCmec V/t657 (7.1%), and ST772-SCCmec V/t10795 (4.3%). Diversity in clonal types of PVL-carrying MRSA strains in our study supports the need to perform a systematic surveillance of PVL-positive MRSA strains.
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Affiliation(s)
- Mehdi Goudarzi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Masoumeh Navidinia
- School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Elham Beiranvand
- Department of Biotechnology, Pasteur Institute of Iran, Tehran, Iran
| | - Hossein Goudarzi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Perales-Adán J, Rubiño S, Martínez-Bueno M, Valdivia E, Montalbán-López M, Cebrián R, Maqueda M. LAB Bacteriocins Controlling the Food Isolated (Drug-Resistant) Staphylococci. Front Microbiol 2018; 9:1143. [PMID: 29946300 PMCID: PMC6005826 DOI: 10.3389/fmicb.2018.01143] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 05/14/2018] [Indexed: 12/20/2022] Open
Abstract
Staphylococci are a group of microorganisms that can be often found in processed food and they might pose a risk for human health. In this study we have determined the content of staphylococci in 7 different fresh goat-milk cheeses. These bacteria were present in all of them, ranging from 103 to 106 CFU/g based on growth on selective media. Thus, a set of 97 colonies was randomly picked for phenotypic and genotypic identification. They could be clustered by RAPD-PCR in 10 genotypes, which were assigned by 16S rDNA sequencing to four Staphylococcus species: Staphylococcus aureus, Staphylococcus chromogenes, S. simulans, and S. xylosus. Representative strains of these species (n = 25) were tested for antibiotic sensitivity, and 11 of them were resistant to at least one of the antibiotics tested, including erythromycin, amoxicillin-clavulanic acid and oxacillin. We also tested two bacteriocins produced by lactic acid bacteria (LAB), namely the circular bacteriocin AS-48 and the lantibiotic nisin. These peptides have different mechanism of action at the membrane level. Nevertheless, both were able to inhibit staphylococci growth at low concentrations ranging between 0.16-0.73 μM for AS-48 and 0.02-0.23 μM for nisin, including the strains that displayed antibiotic resistance. The combined effect of these bacteriocins were tested and the fractional inhibitory concentration index (FICI) was calculated. Remarkably, upon combination, they were active at the low micromolar range with a significant reduction of the minimal inhibitory concentration. Our data confirms synergistic effect, either total or partial, between AS-48 and nisin for the control of staphylococci and including antibiotic resistant strains. Collectively, these results indicate that the combined use of AS-48 and nisin could help controlling (pathogenic) staphylococci in food processing and preventing antibiotic-resistant strains reaching the consumer in the final products.
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Jahanshahi A, Zeighami H, Haghi F. Molecular Characterization of Methicillin and Vancomycin Resistant Staphylococcus aureus Strains Isolated from Hospitalized Patients. Microb Drug Resist 2018; 24:1529-1536. [PMID: 29883257 DOI: 10.1089/mdr.2018.0069] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Objectives: Nosocomial infections caused by methicillin resistant Staphylococcus aureus (MRSA) and emergence of vancomycin resistant S. aureus (VRSA) have led to great concern in healthcare settings worldwide. Methods: A total of 100 S. aureus clinical isolates from hospitalized patients were investigated for antimicrobial susceptibility, the presence of resistance (mecA, vanA, and vanB) and virulence (hlaA, fnbpA, cna, clfA, tsst-1, eta, and spa) encoding genes, and molecular typing based on polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) of spa gene. Results: All isolates were resistant to one or more antibiotics, with the most frequent resistance found against amoxicillin (69%). A total of 46 isolates were MRSA, and 40% of isolates were multidrug resistant (MDR). Of all S. aureus isolates, two isolates were confirmed as VRSA and four isolates confirmed as vancomycin intermediate S. aureus (VISA). The frequency of clfA, cna, tsst-1, and eta genes among MRSA isolates was significantly higher than methicillin sensitive S. aureus (MSSA). The significant correlation between MDR isolates and the carriage of multiple virulence genes was seen. All MDR isolates carried at least four virulence genes. Furthermore, biofilm formation in MRSA isolates was significantly higher than MSSA. The spa gene PCR products generated 4 major and 10 minor types. After digestion of spa amplicons with HindIII restriction enzyme, 10 different patterns ranging 174-938 bp were detected. S2b and S2a subtypes were detected frequently in MRSA isolates. Conclusions: It seems that the appropriate surveillance and control measures are essential to prevent the emergence and transmission of MRSA and VRSA strains in our country.
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Affiliation(s)
- Aidin Jahanshahi
- Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Habib Zeighami
- Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Fakhri Haghi
- Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
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Luo K, Shao F, Kamara KN, Chen S, Zhang R, Duan G, Yang H. Molecular characteristics of antimicrobial resistance and virulence determinants ofStaphylococcus aureusisolates derived from clinical infection and food. J Clin Lab Anal 2018; 32:e22456. [DOI: 10.1002/jcla.22456] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 03/27/2018] [Indexed: 01/23/2023] Open
Affiliation(s)
- Kui Luo
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
| | - Fuye Shao
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
| | - Kadijatu N. Kamara
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
| | - Shuaiyin Chen
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
| | - Rongguang Zhang
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
| | - Guangcai Duan
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine; Xinxiang Medical University; Xinxiang Henan China
| | - Haiyan Yang
- Department of Epidemiology; College of Public Health; Zhengzhou University; Zhengzhou Henan China
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine; Xinxiang Medical University; Xinxiang Henan China
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SCCmec and spa Typing of Staphylococcus aureus Strains Isolated from Patients with Urinary Tract Infection: Emergence of spa Types t426 and t021 in Iran. Jundishapur J Microbiol 2018. [DOI: 10.5812/jjm.62169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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Sedaghat H, Esfahani BN, Halaji M, Jazi AS, Mobasherizadeh S, Havaei SR, Emaneini M, Havaei SA. Genetic diversity of Staphylococcus aureus strains from a teaching hospital in Isfahan, Iran: The emergence of MRSA ST639- SCC mec III and ST343- SCC mec III. IRANIAN JOURNAL OF MICROBIOLOGY 2018; 10:82-89. [PMID: 29997747 PMCID: PMC6039457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVES Staphylococcus aureus is an important pathogen that can be colonized in the nose and increase the risk of spreading infections in hospitals. The present study aimed at determining the phenotypic and genotypic characterization of S. aureus strains isolated from patients and healthcare workers (HCWs) from a teaching hospital in Isfahan, Iran. MATERIALS AND METHODS This cross-sectional study was performed on 262 nasal swabs and 23 clinical isolates that were collected from a teaching hospital during February and April 2016. Staphylococcal cassette chromosome mec (SCCmec) and multilocus sequence typing (MLST) were performed for selected isolates. RESULTS Overall, 23% and 18% of healthcare workers and patients were carriers, respectively. Methicillin-resistant S. aureus (MRSA) rate was 13%, 33% and 52% in nasal HCWs, nasal patients, and clinical samples, respectively. The molecular typing of MRSA isolates revealed that the most common SCCmec type is SCCmec type III (88%). The highest rate of resistance was observed against tetracycline and erythromycin, with 48.7%. The most frequently detected toxin genes among S. aureus isolates were hla (99%) and sea (44%), moreover, pvl genes were detected in (40%) of MRSA isolates. The results of MLST showed 7 different sequence types (STs): ST859 (2/9), ST6 (2/9), ST639 (1/9), ST343 (1/9), ST239 (1/9), ST291 (1/9) and ST25 (1/9). CONCLUSION Our results revealed that ST clones associated with healthcare-associated MRSA (HA-MRSA) are actively circulating among nasal carriage in our healthcare setting, and thus, effective infection control policies are needed to reduce nasal carriage in healthcare settings.
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Affiliation(s)
- Hossein Sedaghat
- Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Bahram Nasr Esfahani
- Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mehrdad Halaji
- Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Azhar Sallari Jazi
- Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Sina Mobasherizadeh
- Nosocomial Infection Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Mohammad Emaneini
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Asghar Havaei
- Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran,Corresponding author: Seyed Asghar Havaei, Ph.D, Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Tel: +983137922478,
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Kim K, Kim S, Jeon JS. Visual Estimation of Bacterial Growth Level in Microfluidic Culture Systems. SENSORS (BASEL, SWITZERLAND) 2018; 18:E447. [PMID: 29401651 PMCID: PMC5855051 DOI: 10.3390/s18020447] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 01/27/2018] [Accepted: 01/31/2018] [Indexed: 12/22/2022]
Abstract
Microfluidic devices are an emerging platform for a variety of experiments involving bacterial cell culture, and has advantages including cost and convenience. One inevitable step during bacterial cell culture is the measurement of cell concentration in the channel. The optical density measurement technique is generally used for bacterial growth estimation, but it is not applicable to microfluidic devices due to the small sample volumes in microfluidics. Alternately, cell counting or colony-forming unit methods may be applied, but these do not work in situ; nor do these methods show measurement results immediately. To this end, we present a new vision-based method to estimate the growth level of the bacteria in microfluidic channels. We use Fast Fourier transform (FFT) to detect the frequency level change of the microscopic image, focusing on the fact that the microscopic image becomes rough as the number of cells in the field of view increases, adding high frequencies to the spectrum of the image. Two types of microfluidic devices are used to culture bacteria in liquid and agar gel medium, and time-lapsed images are captured. The images obtained are analyzed using FFT, resulting in an increase in high-frequency noise proportional to the time passed. Furthermore, we apply the developed method in the microfluidic antibiotics susceptibility test by recognizing the regional concentration change of the bacteria that are cultured in the antibiotics gradient. Finally, a deep learning-based data regression is performed on the data obtained by the proposed vision-based method for robust reporting of data.
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Affiliation(s)
- Kyukwang Kim
- Robotics Program, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Daejeon 34141, Korea.
| | - Seunggyu Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Daejeon 34141, Korea.
| | - Jessie S Jeon
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Daejeon 34141, Korea.
- KAIST Institute for Health Science and Technology, 291 Daehak-ro, Daejeon 34141, Korea.
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