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Junaid M, Thirapanmethee K, Khuntayaporn P, Chomnawang MT. CRISPR-Based Gene Editing in Acinetobacter baumannii to Combat Antimicrobial Resistance. Pharmaceuticals (Basel) 2023; 16:920. [PMID: 37513832 PMCID: PMC10384873 DOI: 10.3390/ph16070920] [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: 05/25/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 07/30/2023] Open
Abstract
Antimicrobial resistance (AMR) poses a significant threat to the health, social, environment, and economic sectors on a global scale and requires serious attention to addressing this issue. Acinetobacter baumannii was given top priority among infectious bacteria because of its extensive resistance to nearly all antibiotic classes and treatment options. Carbapenem-resistant A. baumannii is classified as one of the critical-priority pathogens on the World Health Organization (WHO) priority list of antibiotic-resistant bacteria for effective drug development. Although available genetic manipulation approaches are successful in A. baumannii laboratory strains, they are limited when employed on newly acquired clinical strains since such strains have higher levels of AMR than those used to select them for genetic manipulation. Recently, the CRISPR-Cas (Clustered regularly interspaced short palindromic repeats/CRISPR-associated protein) system has emerged as one of the most effective, efficient, and precise methods of genome editing and offers target-specific gene editing of AMR genes in a specific bacterial strain. CRISPR-based genome editing has been successfully applied in various bacterial strains to combat AMR; however, this strategy has not yet been extensively explored in A. baumannii. This review provides detailed insight into the progress, current scenario, and future potential of CRISPR-Cas usage for AMR-related gene manipulation in A. baumannii.
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Affiliation(s)
- Muhammad Junaid
- Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
- Antimicrobial Resistance Interdisciplinary Group (AmRIG), Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
| | - Krit Thirapanmethee
- Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
- Antimicrobial Resistance Interdisciplinary Group (AmRIG), Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
| | - Piyatip Khuntayaporn
- Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
- Antimicrobial Resistance Interdisciplinary Group (AmRIG), Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
| | - Mullika Traidej Chomnawang
- Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
- Antimicrobial Resistance Interdisciplinary Group (AmRIG), Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
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Mitchell SW, Moran RA, Elbourne LDH, Chapman B, Bull M, Muscatello G, Coleman NV. Impacts of Domestication and Veterinary Treatment on Mobile Genetic Elements and Resistance Genes in Equine Fecal Bacteria. Appl Environ Microbiol 2023; 89:e0159022. [PMID: 36988354 PMCID: PMC10057962 DOI: 10.1128/aem.01590-22] [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: 09/14/2022] [Accepted: 02/05/2023] [Indexed: 03/09/2023] Open
Abstract
Antimicrobial resistance in bacteria is a threat to both human and animal health. We aimed to understand the impact of domestication and antimicrobial treatment on the types and numbers of resistant bacteria, antibiotic resistance genes (ARGs), and class 1 integrons (C1I) in the equine gut microbiome. Antibiotic-resistant fecal bacteria were isolated from wild horses, healthy farm horses, and horses undergoing veterinary treatment, and isolates (9,083 colonies) were screened by PCR for C1I; these were found at frequencies of 9.8% (vet horses), 0.31% (farm horses), and 0.05% (wild horses). A collection of 71 unique C1I+ isolates (17 Actinobacteria and 54 Proteobacteria) was subjected to resistance profiling and genome sequencing. Farm horses yielded mostly C1I+ Actinobacteria (Rhodococcus, Micrococcus, Microbacterium, Arthrobacter, Glutamicibacter, Kocuria), while vet horses primarily yielded C1I+ Proteobacteria (Escherichia, Klebsiella, Enterobacter, Pantoea, Acinetobacter, Leclercia, Ochrobactrum); the vet isolates had more extensive resistance and stronger PC promoters in the C1Is. All integrons in Actinobacteria were flanked by copies of IS6100, except in Micrococcus, where a novel IS5 family element (ISMcte1) was implicated in mobilization. In the Proteobacteria, C1Is were predominantly associated with IS26 and also IS1, Tn21, Tn1721, Tn512, and a putative formaldehyde-resistance transposon (Tn7489). Several large C1I-containing plasmid contigs were retrieved; two of these (plasmid types Y and F) also had extensive sets of metal resistance genes, including a novel copper-resistance transposon (Tn7519). Both veterinary treatment and domestication increase the frequency of C1Is in equine gut microflora, and each of these anthropogenic factors selects for a distinct group of integron-containing bacteria. IMPORTANCE There is increasing acknowledgment that a "one health" approach is required to tackle the growing problem of antimicrobial resistance. This requires that the issue is examined from not only the perspective of human medicine but also includes consideration of the roles of antimicrobials in veterinary medicine and agriculture and recognizes the importance of other ecological compartments in the dissemination of ARGs and mobile genetic elements such as C1I. We have shown that domestication and veterinary treatment increase the frequency of occurrence of C1Is in the equine gut microflora and that, in healthy farm horses, the C1I are unexpectedly found in Actinobacteria, while in horses receiving antimicrobial veterinary treatments, a taxonomic shift occurs, and the more typical integron-containing Proteobacteria are found. We identified several new mobile genetic elements (plasmids, insertion sequences [IS], and transposons) on genomic contigs from the integron-containing equine bacteria.
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Affiliation(s)
- Scott W. Mitchell
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Robert A. Moran
- Institute of Microbiology and Infection, School of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Liam D. H. Elbourne
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Belinda Chapman
- Quantal Bioscience Pty Ltd, Carlingford, New South Wales, Australia
| | - Michelle Bull
- Quantal Bioscience Pty Ltd, Carlingford, New South Wales, Australia
| | - Gary Muscatello
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Nicholas V. Coleman
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
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Alabdali YAJ. Antibiotic resistance and carriage class I integron in clinical isolates of Acinetobacter baumannii from Al Muthanna, Iraq. J Antibiot (Tokyo) 2022; 75:691-697. [PMID: 36195749 DOI: 10.1038/s41429-022-00569-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 09/08/2022] [Accepted: 09/12/2022] [Indexed: 11/09/2022]
Abstract
The goal of this work was to systematically characterize and detect class 1, 2, and 3 integrons with many antibiotic resistance A. baumannii strains collected from a clinical environment in Iraq's Al-Muthanna hospitals. In this investigation, 24 non-replicated clinical strains of A. baumannii were evaluated using Chrome agar as a selective medium and PCR of the rplB gene. The clonal relatedness of the isolates to class 1 integron was evaluated using a PCR technique. The prevalence of class 1 integron was detected by PCR in only 12 clones of A. baumannii followed by HinfI digestion analysis showing three identical bands at 160 bp, 1350 bp, and 870 bp. In addition, PCR sequencing confirmed the presence of gene cassette arrays consisting of aacA4-catB8-aadA1 (100%) in class 1 integron. The sequence analysis of the integron shows 97.87 identity with A. baumannii isolates from Australia (GenBank accession number CP054302) among A. baumannii isolates. The blast analysis of this class I integron showed that the presence of the intI1, aacA4-catB8-aadA1 genes can considerably boost the acquisition of MDR phenotypes in A. baumannii isolates. We concluded that antibiotics of many types are widely used. The presence of integrons in A. baumannii is concerning for public health. In the clinical setting, it appears that the class 1 integron can be used as a predictive biomarker for the presence of MDR phenotypes. In these bacteria, however, the integron does not possess carbapenemases genes.
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Wang L, Sun D, Chen L, Zhou P, Wang K, Wang F, Lei X, Wang Y, Lu Y, Huang G, Gao X. Development and Clinical Application of a Recombinase Polymerase Amplification-Lateral Flow Strip Assay for Detection of Carbapenem-Resistant Acinetobacter baumannii. Front Cell Infect Microbiol 2022; 12:876552. [PMID: 35646723 PMCID: PMC9131934 DOI: 10.3389/fcimb.2022.876552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/17/2022] [Indexed: 12/19/2022] Open
Abstract
Acinetobacter baumannii is a worldwide, primary cause of respiratory tract infections, septicemia, urinary apparatus infections, and secondary meningitis. It can be fatal. Rapid and accurate detection methods are needed to control the spread of carbapenem-resistant A. baumannii (CRAB). Current molecular diagnostic methods are limited and not suitable for on-site detection. In this study, an isothermal detection method using recombinase polymerase amplification (RPA) combined with a lateral flow strip (LFS) was developed to target the blaOXA-51 and blaOXA-23 genes of A. baumannii. The reaction was completed in about 40 min at 37°C. This method can also effectively distinguish A. baumannii and CRAB. The limit of detection of 100-101 CFU/reaction was equal to that of other detection methods. The detection accuracy was equal to that of the qPCR method with the use of clinical samples. The RPA-LFS assay is portable, rapid, and accurate and could replace existing detection methods for on-site detection of A. baumannii and CRAB.
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Affiliation(s)
- Lei Wang
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Dunpo Sun
- Department of Acupuncture and Moxibustion, Lianyungang Affiliated Hospital of Nanjing University of Traditional Chinese Medicine, Lianyungang, China
| | - Li Chen
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Ping Zhou
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Kun Wang
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Fang Wang
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Xingqi Lei
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Yan Wang
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
| | - Yingzhi Lu
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
- *Correspondence: Yingzhi Lu, ; Guanhong Huang, ; Xuzhu Gao,
| | - Guanhong Huang
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
- *Correspondence: Yingzhi Lu, ; Guanhong Huang, ; Xuzhu Gao,
| | - Xuzhu Gao
- Department of Central Laboratory, Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China
- *Correspondence: Yingzhi Lu, ; Guanhong Huang, ; Xuzhu Gao,
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Lotfi F, Shojaie M, Rahbarnia L, Dehnad A, Naghili B, Lotfi H. Molecular characterization and genetic diversity of multidrug- and extensively drug-resistant A. baumannii clinical isolates. GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2021.101455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zhu T, Lei Z, Qu S, Zhao F, Yan L, Chen M, Zhou XW, Di Q, Zhao Y. Comparison of the outer membrane proteomes between clinical carbapenem-resistant and susceptible Acinetobacter baumannii. Lett Appl Microbiol 2022; 74:873-882. [PMID: 35138649 DOI: 10.1111/lam.13672] [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: 06/29/2021] [Revised: 02/03/2022] [Accepted: 02/06/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND AIM Carbapenem resistance has become a major obstacle in combating Acinetobacter baumannii infections. Although enzymatic degradation by β-lactamases is the pivotal mechanism of carbapenem resistance, porin deficiency has also been implicated in the mechanism. In this study, outer membrane proteins (OMPs) pattern of a clinical multidrug-resistant A. baumannii isolate were analyzed in order to attain a deeper understanding of carbapenem resistance strategies. METHODS OMPs extracts respectively separated from carbapenem-resistant and -susceptible clinical A. baumannii isolates were compared using two-dimensional polyacrylamide gel electrophoresis. Differentially expressed proteins were identified by matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF). RESULTS Twenty-three differently expressed proteins were identified between the resistant and susceptible isolates. Among them, six were annotated convincingly as OMPs in UniProt database. CarO was found absent from the resistant isolate and the expression levels of Omp33-36 and Omp25 were significantly lower than that in the susceptible counterpart. Strikingly, a LysM domain/BON superfamily protein, which has been linked to carbapenem resistance in Klebsiella pneumoniae, was found underexpressed by 10-fold in the resistant isolate. CONCLUSION Our study verified some porins which have been proven to play an important role in bacterial resistance against carbapenems. Underexpression of the LysM domain/BON superfamily protein may indicate its possible engagement in bacterial drug resistance, but its actual role requires more investigation.
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Affiliation(s)
- Tao Zhu
- Department of Medical Microbiology and Immunology, Wannan Medical College, Wuhu, 241002, PR China
| | - Zhongying Lei
- Department of Laboratory Medicine, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, 210011, PR China
| | - Su Qu
- Shanghai Vitalgen BioPharma Co, Ltd, Shanghai, 201108, PR China
| | - Fuju Zhao
- Institute of Medical Microbiology and Institutes of Biomedical Sciences, Shanghai Medical College of Fudan University, Shanghai, 200032, PR China
| | - Liang Yan
- Institute of Medical Microbiology and Institutes of Biomedical Sciences, Shanghai Medical College of Fudan University, Shanghai, 200032, PR China
| | - Mingliang Chen
- Department of Microbiology, Shanghai Municipal Center for Disease Control and Prevention, Shanghai, 200336, PR China
| | - Xin Wen Zhou
- Institute of Medical Microbiology and Institutes of Biomedical Sciences, Shanghai Medical College of Fudan University, Shanghai, 200032, PR China
| | - Qu Di
- Institute of Medical Microbiology and Institutes of Biomedical Sciences, Shanghai Medical College of Fudan University, Shanghai, 200032, PR China
| | - Yanfeng Zhao
- Department of Laboratory Medicine, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, 210011, PR China
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Identification of Carbapenemase within Class 1 Integron Structure in Intrinsically Colistin-resistant Enterobacteriaceae. JOURNAL OF MEDICAL MICROBIOLOGY AND INFECTIOUS DISEASES 2021. [DOI: 10.52547/jommid.9.4.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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The Occurrence and Characterization of Class I, II, and III Integrons Among Carbapenemase-Producing Clinical Strains of Acinetobacter baumannii in Tehran, Iran. Jundishapur J Microbiol 2021. [DOI: 10.5812/jjm.117766] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Background: Acinetobacter baumannii has emerged as a critical pathogen with high morbidity and mortality in long-term hospitalized patients who stay in intensive care units. Carbapenemases and integrons are two critical DNA elements that contribute to the emergence of multidrug-resistant (MDR) A. baumannii. Objectives: The current study aimed at characterization and molecular detection of class 1, 2, and 3 integrons among carbapenemase-producing A. baumannii strains recovered from a clinical setting in Tehran, Iran. Methods: A total of 65 non-replicated clinical strains were considered in this study. Class 1, 2, and 3 carbapenemase genes and clonal relatedness of the isolates were investigated by PCR assay. Results: The prevalence of carbapenemases was as follows: blaOXA23 (92.31%), blaVIM (69.23%), and blaNDM (1.54%). In addition, PCR sequencing confirmed the presence of gene cassette arrays consisting of aacA4-catB8-aadA1 (12/46, 26.09%), aadB-aadA1 (26.09%, 12/46), arr2-cm1A5 (30.43%, 14/46), and dfrA1-aadA1 (7.39%, 8/46) in class 1 integron and dfrA1-sat2 (52.94%, 9/17), and sat2-aadA1 (47.06%, 8/17) in class 2 integron. Sequence-based typing of both blaOXA-51-like and ampC revealed the following distribution of three different clone types among isolates: clonal complex (CC) 10 (46.15%, 30/65), CC2 (40%, 26/65), and CC3 (13.85%, 9/65). Statistical analysis showed that the presence of the intI1, blaOXA23, blaVIM, or blaNDM genes can significantly increase the acquiring MDR phenotypes in A. baumannii isolates. Conclusions: High prevalence of carbapenemase-producing A. baumannii harboring integrons is alarming public health. It seems that class 1 integron can be served as a predictive biomarker for the presence of MDR phenotypes in the clinical setting. However, integrons do not carry carbapenemases in these strains.
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Abhari SS, Azizi O, Modiri L, Aslani MM, Assmar M, Fereshteh S, Badmasti F. Two new rapid PCR-based methods for identification of Acinetobacter baumannii isolated from clinical samples. Mol Cell Probes 2021; 58:101732. [PMID: 33878387 DOI: 10.1016/j.mcp.2021.101732] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/07/2021] [Accepted: 04/14/2021] [Indexed: 10/21/2022]
Abstract
The accurate identification of Acinetobacter spp. is challenging due to their high phenotypic and biochemical similarities. Because clinical relevance and antibiotic susceptibility are significantly different among different genomic species of Acinetobacter, the exact identification of A. baumannii is necessary and it can help us prevent inappropriate antibiotic use and inferior clinical care. This project employed a sequence-specific PCR assay for the rpoB region in A. baumannii to distinguish it from non-Acinetobacter baumannii Acinetobacter species. Moreover, a duplex PCR assay was used to detect blaOXA-51-like and gluconolactonase genes as a second identification method. In this study, 210 isolates of Acinetobacter spp. were considered and identified by PCR-sequencing of rpoB gene as a reference test. PCR-sequencing of rpoB revealed that 179 isolates were A. baumannii and 31 were non- A. baumannii Acinetobacter strains. PCR amplification targeting the rpoB gene as the first method, detected 182 isolates of A. baumannii, while duplex PCR assay confirmed 163 isolates as A. baumannii. Data analysis indicated that the sensitivities of sequence-specific PCR of the rpoB gene and duplex PCR assay were 100% and 91.06%, respectively, while specificities were 91.18% and 100%, respectively. Given the data, it was revealed that these two methods showed a reasonable potential for the accurate identification of A. baumannnii from non- A. baumannii species. Sequence-specific PCR assay for the rpoB gene and duplex PCR assay for blaOXA-51-like and gluconolactonase genes are rapid, reliable and cost-effective methods which can be used in clinical laboratories for the accurate identification of A. baumannii.
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Affiliation(s)
- Soha Seyyedi Abhari
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran; Department of Microbiology, Lahijan Branch, Islamic Azad University, Lahijan, Gilan, Iran
| | - Omid Azizi
- Health Sciences Research Center, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
| | - Leila Modiri
- Department of Microbiology, Lahijan Branch, Islamic Azad University, Lahijan, Gilan, Iran
| | | | - Mehdi Assmar
- Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | | | - Farzad Badmasti
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran.
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Liu B, Liu L. Molecular Epidemiology and Mechanisms of Carbapenem-Resistant Acinetobacter baumannii Isolates from ICU and Respiratory Department Patients of a Chinese University Hospital. Infect Drug Resist 2021; 14:743-755. [PMID: 33658811 PMCID: PMC7920613 DOI: 10.2147/idr.s299540] [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] [Received: 12/29/2020] [Accepted: 02/06/2021] [Indexed: 11/23/2022] Open
Abstract
Background The objective of our study is to estimate the differences in molecular epidemiology and resistance mechanisms in carbapenem-resistant Acinetobacter baumannii (CRAB) isolates from the ICU and respiratory department(RD) in Fourth Affiliated Hospital of Harbin Medical University. Methods Carbapenemase genes associated with carbapenem resistance were studied by polymerase chain reaction(PCR). Genotyping was analyzed using multi-locus sequence typing (MLST) and pulsed field gel electrophoresis (PFGE). Results Sixty non-duplicate CRAB isolates from the ICU and RD (n=30, respectively) were collected. All of CRAB strains were not resistant to colistin (0%). The CRAB strains from the ICU were significantly more resistant to tigecycline and cefoperazone/sulbactam compared with the RD (23.3% vs 0%, P=0.03; 53.3% % vs 23.3%, P=0.01, respectively). PCR detection of genes associated with CRAB revealed that the ratio in both the ICU and the RD of blaVIM-2, blaIMP-4, blaNDM-1, blaOXA-23, ampC, and mutation of CarO were present in 23.3% vs 0% (P=0.01), 40% vs 10% (P=0.02), 20% vs 0% (P=0.02), 80% vs 56.7%, 16.7% vs 13.3% and 86.7% vs 60% (P=0.04), respectively. Seven genotypes were detected by the PFGE in the RD and the ICU, respectively. Genotype I was significantly more frequent in the ICU compared with the RD (63.3% vs 36.6%, P=0.03). MLST showed that there were 10 ST genotypes in the RD and four in the ICU, but ST92 in both groups was 33.3% vs 63.3% (P=0.03), respectively. Conclusion There are differences in molecular epidemiology and resistance mechanisms in the CRAB isolates between the ICU and RD.
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Affiliation(s)
- Bin Liu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China
| | - Lei Liu
- Department of Respiratory Medicine, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China
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Uppalapati SR, Sett A, Pathania R. The Outer Membrane Proteins OmpA, CarO, and OprD of Acinetobacter baumannii Confer a Two-Pronged Defense in Facilitating Its Success as a Potent Human Pathogen. Front Microbiol 2020; 11:589234. [PMID: 33123117 PMCID: PMC7573547 DOI: 10.3389/fmicb.2020.589234] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 09/11/2020] [Indexed: 12/12/2022] Open
Abstract
Of all the ESKAPE pathogens, carbapenem-resistant and multidrug-resistant Acinetobacter baumannii is the leading cause of hospital-acquired and ventilator-associated pneumonia. A. baumannii infections are notoriously hard to eradicate due to its propensity to rapidly acquire multitude of resistance determinants and the virulence factor cornucopia elucidated by the bacterium that help it fend off a wide range of adverse conditions imposed upon by host and environment. One such weapon in the arsenal of A. baumannii is the outer membrane protein (OMP) compendium. OMPs in A. baumannii play distinctive roles in facilitating the bacterial acclimatization to antibiotic- and host-induced stresses, albeit following entirely different mechanisms. OMPs are major immunogenic proteins in bacteria conferring bacteria host-fitness advantages including immune evasion, stress tolerance, and resistance to antibiotics and antibacterials. In this review, we summarize the current knowledge of major A. baumannii OMPs and discuss their versatile role in antibiotic resistance and virulence. Specifically, we explore how OmpA, CarO, and OprD-like porins mediate antibiotic and amino acid shuttle and host virulence.
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Affiliation(s)
- Siva R Uppalapati
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, India
| | - Abhiroop Sett
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, India
| | - Ranjana Pathania
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, India
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Copy Number of an Integron-Encoded Antibiotic Resistance Locus Regulates a Virulence and Opacity Switch in Acinetobacter baumannii AB5075. mBio 2020; 11:mBio.02338-20. [PMID: 33024041 PMCID: PMC7542366 DOI: 10.1128/mbio.02338-20] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Acinetobacter baumannii remains a leading cause of hospital-acquired infections. Widespread multidrug resistance in this species has prompted the WHO to name carbapenem-resistant A. baumannii as its top priority for research and development of new antibiotics. Many strains of A. baumannii undergo a high-frequency virulence switch, which is an attractive target for new therapeutics targeting this pathogen. This study reports a novel mechanism controlling the frequency of switching in strain AB5075. The rate of switching from the virulent opaque (VIR-O) to the avirulent translucent (AV-T) variant is positively influenced by the copy number of an antibiotic resistance locus encoded on a plasmid-borne composite integron. Our data suggest that this locus encodes a small RNA that regulates opacity switching. Low-switching opaque variants, which harbor a single copy of this locus, also exhibit decreased virulence. This study increases our understanding of this critical phenotypic switch, while also identifying potential targets for virulence-based A. baumannii treatments. We describe a novel genetic mechanism in which tandem amplification of a plasmid-borne integron regulates virulence, opacity variation, and global gene expression by altering levels of a putative small RNA (sRNA) in Acinetobacter baumannii AB5075. Copy number of this amplified locus correlated with the rate of switching between virulent opaque (VIR-O) and avirulent translucent (AV-T) cells. We found that prototypical VIR-O colonies, which exhibit high levels of switching and visible sectoring with AV-T cells by 24 h of growth, harbor two copies of this locus. However, a subset of opaque colonies that did not form AV-T sectors within 24 h were found to harbor only one copy. The colonies with decreased sectoring to AV-T were designated low-switching opaque (LSO) variants and were found to exhibit a 3-log decrease in switching relative to that of the VIR-O. Overexpression studies revealed that the element regulating switching was localized to the 5′ end of the aadB gene within the amplified locus. Northern blotting indicated that an sRNA of approximately 300 nucleotides (nt) is encoded in this region and is likely responsible for regulating switching to AV-T. Copy number of the ∼300-nt sRNA was also found to affect virulence, as the LSO variant exhibited decreased virulence during murine lung infections. Global transcriptional profiling revealed that >100 genes were differentially expressed between VIR-O and LSO variants, suggesting that the ∼300-nt sRNA may act as a global regulator. Several virulence genes exhibited decreased expression in LSO cells, potentially explaining their decreased virulence.
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Fereshteh S, Abdoli S, Shahcheraghi F, Ajdary S, Nazari M, Badmasti F. New putative vaccine candidates against Acinetobacter baumannii using the reverse vaccinology method. Microb Pathog 2020; 143:104114. [DOI: 10.1016/j.micpath.2020.104114] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 02/15/2020] [Accepted: 03/01/2020] [Indexed: 01/15/2023]
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14
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Abbasi E, Goudarzi H, Hashemi A, Chirani AS, Ardebili A, Goudarzi M, Sharahi JY, Davoudabadi S, Talebi G, Bostanghadiri N. Decreased carO gene expression and OXA-type carbapenemases among extensively drug-resistant Acinetobacter baumannii strains isolated from burn patients in Tehran, Iran. Acta Microbiol Immunol Hung 2020; 68:48-54. [PMID: 32365048 DOI: 10.1556/030.2020.01138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 03/04/2019] [Indexed: 01/18/2023]
Abstract
A major challenge in the treatment of infections has been the rise of extensively drug resistance (XDR) and multidrug resistance (MDR) in Acinetobacter baumannii. The goals of this study were to determine the pattern of antimicrobial susceptibility, blaOXA and carO genes among burn-isolated A. baumannii strains. In this study, 100 A. baumannii strains were isolated from burn patients and their susceptibilities to different antibiotics were determined using disc diffusion testing and broth microdilution. Presence of carO gene and OXA-type carbapenemase genes was tested by PCR and sequencing. SDS-PAGE was done to survey CarO porin and the expression level of carO gene was evaluated by Real-Time PCR. A high rate of resistance to meropenem (98%), imipenem (98%) and doripenem (98%) was detected. All tested A. baumannii strains were susceptible to colistin. The results indicated that 84.9% were XDR and 97.9% of strains were MDR. In addition, all strains bore blaOXA-51 like and blaOXA-23 like and carO genes. Nonetheless, blaOXA-58 like and blaOXA-24 like genes were harbored by 0 percent and 76 percent of strains, respectively. The relative expression levels of the carO gene ranged from 0.06 to 35.01 fold lower than that of carbapenem-susceptible A. baumannii ATCC19606 and SDS - PAGE analysis of the outer membrane protein showed that all 100 isolates produced CarO. The results of current study revealed prevalence of blaOXA genes and changes in carO gene expression in carbapenem resistant A.baumannii.
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Affiliation(s)
- Elham Abbasi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Hossein Goudarzi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Ali Hashemi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Alireza Salimi Chirani
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Abdollah Ardebili
- 2Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
- 3Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
| | - Mehdi Goudarzi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Javad Yasbolaghi Sharahi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Sara Davoudabadi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Ghazaleh Talebi
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
| | - Narjes Bostanghadiri
- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran
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15
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Sobouti B, Mirshekar M, Fallah S, Tabaei A, Fallah Mehrabadi J, Darbandi A. Pan drug-resistant Acinetobacter baumannii causing nosocomial infections among burnt children. Med J Islam Repub Iran 2020; 34:24. [PMID: 32551313 PMCID: PMC7293814 DOI: 10.34171/mjiri.34.24] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Indexed: 01/30/2023] Open
Abstract
Background: Nosocomial infection caused by Acinetobacter baumannii has emerged as a world-wide serious problem in the emergence of multidrug-resistant (MDR). Infections caused by antibiotic-resistant strains of A. baumannii cannot be completely eliminated among the infected patients. This study aimed to monitor antibiotic resistance among A. baumannii strains isolated from burnt children. Methods: After performing biochemical identification tests on 115 isolates, 62 were detected as A. baumannii . Minimum inhibitory concentration (MIC) was used to test susceptibility to colistin, and disk agar diffusion was used for the susceptibility of the isolates to the antibiotics Ciprofloxacin, Amikacin, Gentamicin, Cefepime, Meropenem, Imipenem, Ceftazidime, Levofloxacin and Piperacillin/Tazobactam. Bacterial species were isolated and identified as multidrug-resistant (MDR), extensively drug-resistant (XDR) and pan drug-resistant (PDR), based on the susceptibility patterns to elected antibiotics, deputing different classes of antimicrobial. Results: The antibiotic susceptibility pattern out of a total of 62 bacterial strains used in this study. Thirty-six (58%) strains were categorized as MDR, 17 (27.5%) as XDR, and nine (14.5%) as PDR. Conclusion: To reduce the threat of antimicrobial resistance, MDR, XDR and PDR A. baumannii strains must be evaluated by all clinical microbiology laboratories.
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Affiliation(s)
- Behnam Sobouti
- Burn Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Maryam Mirshekar
- Student Research Committee, Iran University of Medical Sciences, Tehran, Iran.,Department of Microbiology, School of Medicine, Iran University of Medical Sciences Tehran, Iran
| | - Shahrzad Fallah
- Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Aram Tabaei
- Burn Research Center, Iran University of Medical Sciences, Tehran, Iran
| | | | - Atieh Darbandi
- Student Research Committee, Iran University of Medical Sciences, Tehran, Iran.,Department of Microbiology, School of Medicine, Iran University of Medical Sciences Tehran, Iran
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16
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Ayoub Moubareck C, Hammoudi Halat D. Insights into Acinetobacter baumannii: A Review of Microbiological, Virulence, and Resistance Traits in a Threatening Nosocomial Pathogen. Antibiotics (Basel) 2020; 9:antibiotics9030119. [PMID: 32178356 PMCID: PMC7148516 DOI: 10.3390/antibiotics9030119] [Citation(s) in RCA: 212] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 03/01/2020] [Accepted: 03/02/2020] [Indexed: 12/12/2022] Open
Abstract
Being a multidrug-resistant and an invasive pathogen, Acinetobacter baumannii is one of the major causes of nosocomial infections in the current healthcare system. It has been recognized as an agent of pneumonia, septicemia, meningitis, urinary tract and wound infections, and is associated with high mortality. Pathogenesis in A. baumannii infections is an outcome of multiple virulence factors, including porins, capsules, and cell wall lipopolysaccharide, enzymes, biofilm production, motility, and iron-acquisition systems, among others. Such virulence factors help the organism to resist stressful environmental conditions and enable development of severe infections. Parallel to increased prevalence of infections caused by A. baumannii, challenging and diverse resistance mechanisms in this pathogen are well recognized, with major classes of antibiotics becoming minimally effective. Through a wide array of antibiotic-hydrolyzing enzymes, efflux pump changes, impermeability, and antibiotic target mutations, A. baumannii models a unique ability to maintain a multidrug-resistant phenotype, further complicating treatment. Understanding mechanisms behind diseases, virulence, and resistance acquisition are central to infectious disease knowledge about A. baumannii. The aims of this review are to highlight infections and disease-producing factors in A. baumannii and to touch base on mechanisms of resistance to various antibiotic classes.
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Affiliation(s)
- Carole Ayoub Moubareck
- College of Natural and Health Sciences, Zayed University, Dubai P.O. Box 144534, UAE
- Correspondence: ; Tel.: +971-4-402-1745
| | - Dalal Hammoudi Halat
- Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese International University, Beirut, Bekaa Campuses 1103, Lebanon;
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17
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Detection of blaOXA-23 and blaNDM-1 carbapenemase among clinical isolates of A. baumannii in Tabriz, north-west of Iran. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2019.100555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Beigverdi R, Sattari-Maraji A, Emaneini M, Jabalameli F. Status of carbapenem-resistant Acinetobacter baumannii harboring carbapenemase: First systematic review and meta-analysis from Iran. INFECTION GENETICS AND EVOLUTION 2019; 73:433-443. [DOI: 10.1016/j.meegid.2019.06.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 05/22/2019] [Accepted: 06/04/2019] [Indexed: 12/13/2022]
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19
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Ghazalibina M, Mortazavi H, Babadi M, Rahimi M, Khaledi A, Teymouri M, Saburi E. Prevalence of Integrons and Antibiotic Resistance Pattern in Acinetobacter baumannii Isolated from Clinical Samples of Iranian Patients: A Systematic Review and Meta-analysis. Ethiop J Health Sci 2019; 29:639-648. [PMID: 31666786 PMCID: PMC6813273 DOI: 10.4314/ejhs.v29i5.15] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Accepted: 07/01/2019] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Acinetobacter baumannii is an important opportunistic nosocomial pathogen. Class 1 integrons in A. baumannii plays a significant role in antibiotic resistance. Therefore, this study aimed to investigate the prevalence of integrons and antibiotic resistance pattern in A. baumannii isolated from clinical samples of Iranian patients. METHODS The Medical Subject Headings (MeSH) and the keywords with the help of Boolean operators ("AND" or "OR") were used alone or in combination to conduct the search. The searching process was conducted in the Web of Science, PubMed, Cochrane Library, Scopus, and Google Scholar databases and, also Iranian databases. The search was restricted to relevant English and Persian cross-sectional publications reporting the prevalence of Int1 in A. baumannii isolated from clinical samples from 1 January 2000 to 31 December 2018. The data were analyzed using Comprehensive Meta-Analysis software. Regarding the heterogeneity of studies, the random effects model was used. Cochrane Q and I2 tests was used to evaluate statistical heterogeneity between the studies. RESULTS Fifteen studies were included in the analysis. The combined prevalence of class 1 integrons in A. baumannii was 55.2% (95% CI: 44.8-65.1). The pooled prevalence of MDR A. baumannii isolates was 68.1%. The highest resistance belonged to Aztreonam, followed by Ciprofloxacin, and Ceftazidime with a resistance rate of 97.6%, 92.8%, and 91.6%, respectively. Tobramycin was reported as an effective antibiotic. CONCLUSIONS The present study reported an alarmingly high prevalence of class 1 Integrons, and MDR isolates of A. baumannii recovered from clinical samples that should be considered.
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Affiliation(s)
- Mehran Ghazalibina
- Department of Microbiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamed Mortazavi
- Geriatric Care Research Center, Department of Geriatric Nursing, School of Nursing and Midwifery, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Mahtab Babadi
- Infectious Diseases Research Center, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
| | - Mohammadreza Rahimi
- Infectious Diseases Research Center, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
| | - Azad Khaledi
- Infectious Diseases Research Center, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
| | - Manouchehr Teymouri
- Natural Products and Medicinal Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Ehsan Saburi
- Immunogenetic and Cell Culture Department, Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
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20
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Biofilm Formation in Staphylococcus epidermidis Isolated from Hospitalized Patients. ARCHIVES OF CLINICAL INFECTIOUS DISEASES 2019. [DOI: 10.5812/archcid.64496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Nasiri MJ, Zamani S, Fardsanei F, Arshadi M, Bigverdi R, Hajikhani B, Goudarzi H, Tabarsi P, Dabiri H, Feizabadi MM. Prevalence and Mechanisms of Carbapenem Resistance in Acinetobacter baumannii: A Comprehensive Systematic Review of Cross-Sectional Studies from Iran. Microb Drug Resist 2019; 26:270-283. [PMID: 30822197 DOI: 10.1089/mdr.2018.0435] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Introduction: Carbapenem-resistant Acinetobacter baumannii (CRAB) is recognized to be among the most difficult antimicrobial-resistant gram-negative bacilli to control and treat. An understanding of the epidemiology of CRAB and the mechanisms of resistance to carbapenems is necessary to develop strategies to curtail their spread. Methods: Electronic databases were searched from January 1995 to December 2017 for all studies, which: (1) provide data on the frequency and antibiotic resistance profile of the isolated A. baumannii and (2) describe the mechanisms of carbapenem resistance in detail. Results: Sixty-eight studies were found referring to mechanisms of carbapenem resistance in clinical isolates of A. baumannii, and 56 studies were found referring to the frequency of CRAB. The pooled frequency of carbapenem resistance was 85.1% (95% confidence interval [CI]: 82.2-88.1) in 8,067 clinical isolates of A. baumannii. Resistances due to blaOXA23 (55.3%), blaOXA24 (41.4%), and blaOXA58 (5.2%) genes were the most prevalent reported mechanisms of resistance to carbapenem, respectively. Conclusions: Our data warn that CRAB will rise if the current situation remains uncontrolled. Better control infection strategies and antibiotic managements, particularly in the health care systems, are needed to limit the spread of this pathogen.
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Affiliation(s)
- Mohammad Javad Nasiri
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Samin Zamani
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran.,Department of Microbiology, School of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Fatemeh Fardsanei
- Division of Microbiology, Department of Pathobiology, School of Public Health, Tehran University of Medical Science, Tehran, Iran
| | - Mania Arshadi
- Department of Medical Laboratory Sciences, Faculty of Para Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Reza Bigverdi
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Bahareh Hajikhani
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Goudarzi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Payam Tabarsi
- Clinical TB and Epidemiology Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Dabiri
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Mehdi Feizabadi
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
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22
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Abhari SS, Badmasti F, Modiri L, Aslani MM, Asmar M. Circulation of imipenem-resistant Acinetobacter baumannii ST10, ST2 and ST3 in a university teaching hospital from Tehran, Iran. J Med Microbiol 2019; 68:860-865. [PMID: 31050632 DOI: 10.1099/jmm.0.000987] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
PURPOSE Multi-drug resistant (MDR) Acinetobacter baumannii has introduced a worldwide health crisis. The purposes of this study were to characterize the clonal relatedness among MDR clinical strains and to introduce a new two-locus typing method confirmed by multi-locus sequence typing (MLST). METHODOLOGY In this study, we determined antimicrobial resistance, detected genes associated with carbapenem resistance and characterized clonal relatedness among 99 clinical isolates extracted from 82 hospitalized inpatients in a university hospital. RESULTS Of the 99 A. baumannii isolates, 92.9% (92/99) were resistant to imipenem and 97.9% (97/99) had an MDR profile. We found that the high prevalence of blaVIM [94.9% (94/99)] and blaOXA-23-like [93.93% (93/99)] is the main mechanism of carbapenem resistance. This study proposes a new two-locus typing (blaOXA-51-like and ampC) method for the rapid identification of clonal complexes (CCs). The results of this method and confirmation by MLST show that clinical isolates carry blaOXA-68 as well as ampC-10 or ampC-20 genes belonging to CC10 (ST10); blaOXA-66 and ampC-2 belonging to CC2 (ST2); and blaOXA-71 and ampC-3 belonging to CC3 (ST3). One isolate had blaOXA-90 with an undetermined allele number of ampC belonging to ST513. CONCLUSION The high prevalence of MDR strains and the circulation of four limited clones, including ST10 (45/99), ST2 (41/99), ST3 (12/99) and ST513 (1/99), in the clinical setting highlights the importance of a rigorous infection control programme. The two-locus typing method has more discrimination than the application of each method separately and it could be applied for the rapid determination of the CC without performing MLST.
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Affiliation(s)
- Soha Seyyedi Abhari
- 1 Department of Microbiology, Lahijan Branch, Islamic Azad University, Lahijan, Gilan, Iran
| | - Farzad Badmasti
- 2 Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran
| | - Leila Modiri
- 1 Department of Microbiology, Lahijan Branch, Islamic Azad University, Lahijan, Gilan, Iran
| | | | - Mehdi Asmar
- 3 Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
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23
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Different Virulence Capabilities and ompA Expressions in ST2 and ST513 of Multidrug-Resistant Acinetobacter baumannii. Curr Microbiol 2019; 76:723-731. [DOI: 10.1007/s00284-019-01686-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 04/08/2019] [Indexed: 10/27/2022]
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24
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Meshkat Z, Amini Y, Sadeghian H, Salimizand H. ISAba1/bla OXA-23-like family is the predominant cause of carbapenem resistance in Acinetobacter baumannii and Acinetobacter nosocomialis in Iran. INFECTION GENETICS AND EVOLUTION 2019; 71:60-66. [PMID: 30902743 DOI: 10.1016/j.meegid.2019.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 03/15/2019] [Accepted: 03/15/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Zahra Meshkat
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Medical School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Yousef Amini
- Department of Microbiology, Medical School, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Hamid Sadeghian
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Himen Salimizand
- Liver and Digestive Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran; Department of Microbiology, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
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