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Aggarwal S, Jena S, Panda S, Sharma S, Dhawan B, Nath G, Singh NP, Nayak KC, Singh DV. Antibiotic Susceptibility, Virulence Pattern, and Typing of Staphylococcus aureus Strains Isolated From Variety of Infections in India. Front Microbiol 2019; 10:2763. [PMID: 31866962 PMCID: PMC6904308 DOI: 10.3389/fmicb.2019.02763] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/12/2019] [Indexed: 01/10/2023] Open
Abstract
Staphylococcus aureus is one of the major causes of nosocomial infections. This organism produces powerful toxins and cause superficial lesions, systemic infections, and several toxemic syndromes. A total of 109 S. aureus strains isolated from a variety of infections like ocular diseases, wound infection, and sputum were included in the study. Minimum inhibitory concentration (MIC) was determined against 8 antimicrobials. PCR determined the presence of 16S rRNA, nuc, mecA, czrC, qacA/B, pvl, and toxin genes in S. aureus isolates. Pulse-field gel electrophoresis (PFGE), multi-locus sequence typing (MLST), SCCmec, spa-, and agr-typing and serotyping determined the diversity among them. All isolates of S. aureus were resistant to two or more than two antibiotics and generated 32 resistance patterns. These isolates were positive for 16S rRNA and S. aureus-specific nuc gene, but showed variable results for mecA, czrC, and qacA/B and pvl genes. Of the 32 methicillin-resistant S. aureus (MRSA), 13 strains carried SCCmec type V, seven type IV, two type III, and nine carried unreported type UT6. Of the 109 strains, 98.2% were positive for hlg, 94.5% for hla, 86.2% for sei, 73.3% for efb, 70.6% for cna, 30.2% for sea, and 12.8% for sec genes. Serotypes VII and VI were prevalent among S. aureus strains. PFGE analysis grouped the 109 strains into 77 clusters. MLST classified the strains into 33 sequence types (ST) and eight clonal complexes (CCs) of which 12 were singletons, and two belong to new allelic profiles. Isolates showed 46 spa-types that included two new spa-types designated as t14911 and t14912. MRSA and methicillin-susceptible S. aureus (MSSA) isolates were diverse in terms of antibiotic resistance pattern, toxin genotypes, SCCmec types, serotypes and PFGE, MLST, and spa-types. However, few isolates from eye infection and wound infection belong to CC239, ST239, and spa-type t037/t657. The study thus suggests that S. aureus strains are multidrug resistant, virulent, and diverse irrespective of sources and place of isolation. These findings necessitate the continuous surveillance of multidrug-resistant and virulent S. aureus and monitoring of the transmission of infection.
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Affiliation(s)
- Shifu Aggarwal
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, India
| | - Smrutiti Jena
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, India
| | - Sasmita Panda
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, India
| | - Savitri Sharma
- Jhaveri Microbiology Centre, LV Prasad Eye Institute, Brien Holden Eye Research Centre, Kallam Anji Reddy Campus, Hyderabad, India
| | - Benu Dhawan
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India
| | - Gopal Nath
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - N P Singh
- Department of Microbiology, Faculty of Medical Sciences, University of Delhi, New Delhi, India
| | | | - Durg Vijai Singh
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, India.,Department of Biotechnology, Central University of South Bihar, Gaya, India
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Soleimani N, Aganj M, Ali L, Shokoohizadeh L, Sakinc T. Frequency distribution of genes encoding aminoglycoside modifying enzymes in uropathogenic E. coli isolated from Iranian hospital. BMC Res Notes 2014; 7:842. [PMID: 25424607 PMCID: PMC4258249 DOI: 10.1186/1756-0500-7-842] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 11/18/2014] [Indexed: 11/17/2022] Open
Abstract
Background Escherichia coli is considered as the most common cause of urinary tract infection (UTI) and acquired multiple resistances to a wide range of antibiotics such as aminoglycosides. Enzymatic alteration of aminoglycosides (AMEs) by aminoglycoside- modifying enzymes is the main mechanism of resistance to these antibiotics in E. coli. The aim of this study was detection and investigation of frequency of genes encoding aminoglycoside modifying enzymes (aac(3)-IIa and ant(2′′)-Ia) in UPEC isolated from hospitalized patients in teaching hospital of Tehran, Iran. Findings A total of 276 UPEC were obtained from Urine samples in a hospital from Tehran. Antibiotic susceptibility to aminoglycosides was determined by disk diffusion method according CLSI guidelines in UPEC isolates. MICs of target antibiotics were determined by agar dilution method. All isolates were screened for the presence of the AMEs genes using the PCR. The results of disk diffusion showed 21%, 24.6%, 23.18%, 3.62% and 6.15% of isolates were resistant to Gentamicin, Tobramycin, Kanamicin, Amikacin and Netilmicin respectively. The agar dilution’s results (MICs) were high, 66.19% for Gentamicin. The aac (3)-IIa and ant(2″)-Ia genes were detected in (78.87%) and 47.88% of isolates respectively. Conclusions This study shows the high frequency of genes encoding (AMEs) aac(3)-IIa and ant(2”)-Ia genes and their relationship between different aminoglycoside resistance phenotypes.
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Affiliation(s)
- Neda Soleimani
- Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Po Box:14115-158, Tehran, Iran.
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KRONVALL GÖRAN. Antimicrobial resistance 1979-2009 at Karolinska hospital, Sweden: normalized resistance interpretation during a 30-year follow-up on Staphylococcus aureus and Escherichia coli resistance development. APMIS 2010; 118:621-39. [DOI: 10.1111/j.1600-0463.2010.02660.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pinilla G, Muñoz L, Ruiz AI, Chavarro B, Cifuentes Y. Aislamiento de Staphylococcus epidermidis portador de integrón clase 1 en un paciente con sepsis neonatal. INFECTIO 2009. [DOI: 10.1016/s0123-9392(09)70150-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Prevalence of the Genes Encoding Aminoglycoside-Modifying Enzymes and Methicillin Resistance Among Clinical Isolates ofStaphylococcus aureusin Tehran, Iran. Microb Drug Resist 2009; 15:109-13. [DOI: 10.1089/mdr.2009.0897] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Usang UE, Sowande OA, Adejuyigbe O, Bakare TIB, Ademuyiwa OA. The role of preoperative antibiotics in the prevention of wound infection after day case surgery for inguinal hernia in children in Ile Ife, Nigeria. Pediatr Surg Int 2008; 24:1181-5. [PMID: 18726104 DOI: 10.1007/s00383-008-2241-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/07/2008] [Indexed: 11/25/2022]
Abstract
PURPOSE Day case surgery for inguinal hernia had been an established practice of the Paediatric Surgery Unit, OAUTHC, Ile Ife for about two decades. In a retrospective review of the practice from the same center, a high incidence of postoperative wound infection was noted, which was attributed to the poor personal hygiene of the patients. This prospective study, therefore, was performed to evaluate the role of a single dose of preoperative antibiotic (using gentamicin) in the prevention of these wound infections after day case surgery for inguinal hernia in children. METHODS This was a prospective study carried out over a period of 8 months from 11 April 2004 to 20 December 2004. During this period, 88 children aged from birth to 15 years were randomized into two groups of equal numbers to undergo elective inguinal herniotomy. The children in the test group received prophylactic intravenous gentamicin, 30 min before a groin crease incision was made, while those in the control group did not. All patients were subsequently followed up for 32 days for any evidence of a wound infection. RESULTS There were 104 wounds in the ratio of 50:54 in the control and test groups, respectively. All 54 wounds of the children who received prophylactic gentamicin healed primarily and without complication. Five cases of wound infections occurred in the control group, giving an infection rate of 4.8% (P < 0.041). Staphylococcus aureus was the single pathogen isolated from the infected postherniotomy wounds and this organism was wholly sensitive to gentamicin. CONCLUSION From the findings in this study, administration of preoperative gentamicin has a role in the prevention of wound infection after day case surgery for inguinal hernias in susceptible children. Preoperative intravenous gentamicin is therefore recommended as a prophylactic measure against wound infection after day case surgery for inguinal hernias in those children at risk of wound infection.
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Affiliation(s)
- U E Usang
- Paediatric Surgery Unit, Department of Surgery, University of Calabar Teaching Hospital, Calabar, Nigeria.
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Aminoglycosides resistance in clinical isolates of Staphylococcus aureus from a University Hospital in Bialystok, Poland. Folia Histochem Cytobiol 2008; 46:225-8. [PMID: 18519242 DOI: 10.2478/v10042-008-0034-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Staphylococcus aureus obtained from a University Hospital in Poland were characterized in relation to resistance to aminoglycoside antibiotics and the distribution of the genes encoding the most clinically relevant aminoglycoside modifying enzymes (AMEs). Of a total of 118 S. aureus, 45 (38.1%) isolates were found to be resistant to at least one of the tested antibiotics. All aminoglycoside resistant isolates except one 44 (97.8%) were resistant to kanamycin. The majority of strains 37 (82.2%) and 32 (71.1%) expressed resistance to neomycin and tobramycin, respectively. Eleven strains (24.4%) were resistant to gentamicin or amikacin. All S. aureus strains were sensitive to netilmicin. The most prevalent resistance gene was aac(6')-Ie+aph(2') found in 13 (28.9%) strains and 12 (26.7%) isolates carried ant(4')-Ia gene, whilst aph(3')-IIIa gene was detected in only 7 (15.6%) isolates. Additionally, the ant(6)-Ia and str genes were detected in 14 (31.1%) and 2 (4.4%) strains, respectively. Ten (22.2%) strains resistant to amikacin, tobramycin, kanamycin or neomycin did not harbor any of the above-noted genes.
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Chandrakanth RK, Raju S, Patil SA. Aminoglycoside-resistance mechanisms in multidrug-resistant Staphylococcus aureus clinical isolates. Curr Microbiol 2008; 56:558-62. [PMID: 18320273 DOI: 10.1007/s00284-008-9123-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2007] [Accepted: 12/11/2007] [Indexed: 12/01/2022]
Abstract
Aminoglycoside resistance in six clinically isolated Staphylococcus aureus was evaluated. Genotypical examination revealed that three isolates (HLGR-10, HLGR-12, and MSSA-21) have aminoglycoside-modifying enzyme (AME) coding genes and another three (GRSA-2, GRSA-4, and GRSA-6) lacked these genes in their genome. Whereas isolates HLGR-10 and HLGR-14 possessed bifunctional AME coding gene aac(6')-aph(2''), and aph(3')-III and showed high-level resistance to gentamycin and streptomycin, MSSA-21 possessed aph(3')-III and exhibited low resistance to gentamycin, streptomycin, and kanamycin. The remaining three isolates (GRSA-2, GRSA-4, and GRSA-6) exhibited low resistance to all the aminoglycosides because they lack aminoglycoside-modifying enzyme coding genes in their genome. The transmission electron microscopy of the three isolates revealed changes in cell size, shape, and septa formation, supporting the view that the phenomenon of adaptive resistance is operative in these isolates.
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Affiliation(s)
- Keith Poole
- Department of Microbiology & Immunology, Rm. 737 Botterell Hall, Queen's University, Kingston, ON K7L 3N6, Canada.
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Abstract
Aminoglycoside antibiotics have had a major impact on our ability to treat bacterial infections for the past half century. Whereas the interest in these versatile antibiotics continues to be high, their clinical utility has been compromised by widespread instances of resistance. The multitude of mechanisms of resistance is disconcerting but also illuminates how nature can manifest resistance when bacteria are confronted by antibiotics. This article reviews the most recent knowledge about the mechanisms of aminoglycoside action and the mechanisms of resistance to these antibiotics.
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Affiliation(s)
- Sergei B Vakulenko
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
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Abstract
Acrylic cement is used to secure implants to bone. When mixed with antibiotics or anticancer agents, acrylic cement slowly releases these agents while retaining its mechanical properties, thus providing specific in situ treatment.
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Affiliation(s)
- Norbert Passuti
- Clinique Chirurgicale Orthopédique, CHU, Hôtel Dieu, 44093 cedex 1, Nantes, France.
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Maltezou HC, Baka M, Gombakis N, Koliouskas DE, Kosmidou H, Malaka-Zafiriou E, Kafetzis DA. Comparison of isepamicin with amikacin for the empirical treatment of febrile neutropenic children with malignancies. Int J Antimicrob Agents 2001; 18:383-6. [PMID: 11691573 DOI: 10.1016/s0924-8579(01)00420-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The efficacy and safety of isepamicin at 7.5 mg/kg i.v. q 12 h was prospectively compared with that of amikacin at the same dose for the treatment of febrile neutropenic children with malignancies. Thirty-nine patients were enrolled in the study; 25 received isepamicin and 14 amikacin. Clinical and bacteriological response rates were 100% for both groups. No adverse events occurred. Median peak serum levels were 19.7 mg/l for isepamicin and 19.20 mg/l for amikacin. Median trough serum levels were 0.72 mg/l for isepamicin and 0.68 mg/l for amikacin. It was concluded that isepamicin was as effective and safe as amikacin for the treatment of febrile neutropenic children with malignancies, and might be used in areas where resistance to other aminoglycosides is a problem.
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Affiliation(s)
- H C Maltezou
- University of Athens Second Department of Pediatrics, P. and A. Kyriakou Children's Hospital, Athens, 11527 Greece
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Leegaard TM, Bevanger L, Jureen R, Lier T, Melby KK, Caugant DA, Oddvar Frøholm L, Høiby EA. Antibiotic sensitivity still prevails in Norwegian blood culture isolates. Int J Antimicrob Agents 2001; 18:99-106. [PMID: 11516931 DOI: 10.1016/s0924-8579(01)00364-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We describe the antimicrobial susceptibility of bacteraemia isolates from Norway. From March 1998 to February 1999, four university hospitals covering all parts of Norway collected their first 10 isolates each month. Minimal inhibitory concentrations were determined for: Enterobacteriaceae (n=192), staphylococci (n=89) and Streptococcus pneumoniae (n=69) using the Etest. NCCLS breakpoints were used. About 20% of all blood culture isolates in Norway in this period were investigated. Compared with countries outside Scandinavia antibiotic sensitivity still prevails. Only minor differences in resistance were found between participating hospitals, between hospital departments and between hospital- and community-acquired pathogens. The prudent use of antibiotics in Norway may contribute to the fact that antibiotic resistance still remains low in the most common bacterial pathogens causing bloodstream infections.
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Affiliation(s)
- T M Leegaard
- Department of Bacteriology, National Institute of Public Health, PO Box 4404 Nydalen, N-0403 Oslo, Norway.
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Kafetzis DA, Maltezou HC, Mavrikou M, Siafas C, Paraskakis I, Delis D, Bartsokas C. Isepamicin versus amikacin for the treatment of acute pyelonephritis in children. Int J Antimicrob Agents 2000; 14:51-5. [PMID: 10717501 DOI: 10.1016/s0924-8579(99)00138-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this study we compared the efficacy and safety of isepamicin versus amikacin at a dose of 7.5 mg/kg i.v. q12h for 10-14 days in children with pyelonephritis. Sixteen children were enrolled in the study; ten received isepamicin and six amikacin. Urine cultures grew Escherichia coli in all patients. All patients were treated successfully with either isepamicin or amikacin. Clinical and bacteriological response rates were 100% for both groups. No adverse events occurred. Peak serum levels ranged from 9.05 to 30.70 mg/l (median: 16.165) and from 12.20 to 25.90 mg/l (median: 19.05) for isepamicin and amikacin, respectively. Trough serum levels ranged from 0.11 to 3.20 mg/l (median: 0.75) and from 0.1 to 2.1 mg/l (median: 0.655), respectively. Isepamicin was shown to be as effective and safe as amikacin in the treatment of children with pyelonephritis and might prove an advantageous alternative in areas with high incidence of resistance to other aminoglycosides.
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Affiliation(s)
- D A Kafetzis
- Second Department of Pediatrics, University of Athens, P. and A. Kyriakou Children's Hospital, Athens, Greece.
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Udo EE, Dashti AA. Detection of genes encoding aminoglycoside-modifying enzymes in staphylococci by polymerase chain reaction and dot blot hybridization. Int J Antimicrob Agents 2000; 13:273-9. [PMID: 10755241 DOI: 10.1016/s0924-8579(99)00124-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Dot blot hybridization and the polymerase chain reaction (PCR) were used to study aminoglycoside-modifying enzymes in aminoglycoside-resistant staphylococci isolated in hospitals in Kuwait. DNA encoding the acetyltransferase (AAC) (6')-phosphotransferase (APH) (2"), nucleotidyltransferase (ANT) (4') and APH (3') enzymes were detected in Staphylococcus aureus and coagulase negative staphylococci. ANT (4') was the most common enzyme detected. The majority of isolates contained genes for all three modifying enzymes, AAC (6')-APH (2"), ANT (4') and APH (3'); only few isolates carried genes for a single modifying enzyme. Genes encoding the AAC (6')-APH (2") were detected in all except two gentamicin-resistant isolates. In these isolates the genes for the AAC (6')-APH (2") enzyme could not be detected by PCR and dot blot hybridization. Whereas antibiotic resistance testing could be used to predict the presence of the AAC (6')-APH (2") enzyme it was not useful in predicting the presence of the ANT (4') or APH (3') enzymes in gentamicin-resistant isolates. Results obtained with dot blot hybridization were comparable to those obtained with PCR. However, PCR was fast and results were obtained within the same day. Therefore PCR would be preferred for the detection and confirmation of the presence of aminoglycoside-modifying enzymes in clinical microbiology laboratories.
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Affiliation(s)
- E E Udo
- Department of Microbiology, Faculty of Medicine, Kuwait University, Safat.
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Martineau F, Picard FJ, Lansac N, Ménard C, Roy PH, Ouellette M, Bergeron MG. Correlation between the resistance genotype determined by multiplex PCR assays and the antibiotic susceptibility patterns of Staphylococcus aureus and Staphylococcus epidermidis. Antimicrob Agents Chemother 2000; 44:231-8. [PMID: 10639342 PMCID: PMC89663 DOI: 10.1128/aac.44.2.231-238.2000] [Citation(s) in RCA: 263] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Clinical isolates of Staphylococcus aureus (a total of 206) and S. epidermidis (a total of 188) from various countries were tested with multiplex PCR assays to detect clinically relevant antibiotic resistance genes associated with staphylococci. The targeted genes are implicated in resistance to oxacillin (mecA), gentamicin ¿aac(6')-aph(2"), and erythromycin (ermA, ermB, ermC, and msrA). We found a nearly perfect correlation between genotypic and phenotypic analysis for most of these 394 strains, showing the following correlations: 98% for oxacillin resistance, 100% for gentamicin resistance, and 98.5% for erythromycin resistance. The discrepant results were (i) eight strains found to be positive by PCR for mecA or ermC but susceptible to the corresponding antibiotic based on disk diffusion and (ii) six strains of S. aureus found to be negative by PCR for mecA or for the four erythromycin resistance genes targeted but resistant to the corresponding antibiotic. In order to demonstrate in vitro that the eight susceptible strains harboring the resistance gene may become resistant, we subcultured the susceptible strains on media with increasing gradients of the antibiotic. We were able to select cells demonstrating a resistant phenotype for all of these eight strains carrying the resistance gene based on disk diffusion and MIC determinations. The four oxacillin-resistant strains negative for mecA were PCR positive for blaZ and had the phenotype of beta-lactamase hyperproducers, which could explain their borderline oxacillin resistance phenotype. The erythromycin resistance for the two strains found to be negative by PCR is probably associated with a novel mechanism. This study reiterates the usefulness of DNA-based assays for the detection of antibiotic resistance genes associated with staphylococcal infections.
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Affiliation(s)
- F Martineau
- Centre de Recherche en Infectiologie de l'Université Laval, Université Laval, Québec G1V 4G2, Canada
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Vanhoof R, Nyssen HJ, Van Bossuyt E, Hannecart-Pokorni E. Aminoglycoside resistance in Gram-negative blood isolates from various hospitals in Belgium and the Grand Duchy of Luxembourg. Aminoglycoside Resistance Study Group. J Antimicrob Chemother 1999; 44:483-8. [PMID: 10588310 DOI: 10.1093/jac/44.4.483] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A total of 1102 consecutive clinical blood isolates, including 897 Enterobacteriaceae and 205 non-fermenting bacilli, were obtained from 13 university and university-affiliated hospitals, which were divided into a Northern and a Southern group. Resistance to gentamicin, tobramycin, netilmicin, amikacin and isepamicin was determined using a microdilution technique according to NCCLS procedures. The overall mean resistance level was 5.9% for gentamicin, 7.7% for tobramycin, 7.5% for netilmicin, 2.8% for amikacin and 1.2% for isepamicin. Resistance to amikacin and isepamicin was significantly higher in the Northern hospitals than in the Southern hospitals. In total, 157 isolates were found not to be susceptible to aminoglycosides. By PCR, 179 aminoglycoside resistance mechanisms, i.e. 150 genes encoding modifying enzymes and 29 permeability mechanisms, were detected in 148 isolates. A resistance mechanism could not be detected in nine isolates. Moreover, in a further 14 isolates the resistance profile was not fully explained by the detected genes. The aac(6')-I genes were found to be the most predominant resistance mechanism in both the Northern and Southern isolates, followed by aac(3) genes and permeability resistance. A total of 29 non-susceptible isolates harboured a combination of genes, 72.4% of which were a combination with the aac(6')-lb gene. The majority of these combinations were broad-spectrum combinations which represented 9.0% of the resistance mechanisms in non-susceptible Enterobacteriaceae and 19.3% in the non-fermenting bacilli.
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Affiliation(s)
- R Vanhoof
- Unit of Antibiotic Research, Pasteur Institute Brussels, Belgium
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Hamze M, Izard D. Sensibilité des entérobactéries aux antibiotiques. Situation en 1997 au Nord du Liban. Med Mal Infect 1999. [DOI: 10.1016/s0399-077x(99)80098-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mingeot-Leclercq MP, Glupczynski Y, Tulkens PM. Aminoglycosides: activity and resistance. Antimicrob Agents Chemother 1999; 43:727-37. [PMID: 10103173 PMCID: PMC89199 DOI: 10.1128/aac.43.4.727] [Citation(s) in RCA: 537] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Affiliation(s)
- M P Mingeot-Leclercq
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Bruxelles, Belgium.
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Rønnestad A, Abrahamsen TG, Gaustad P, Finne PH. Antibiotic susceptibility of blood culture isolates after nearly two decades with netilmicin and ampicillin in neonatal septicaemia. APMIS 1999; 107:257-62. [PMID: 10225325 DOI: 10.1111/j.1699-0463.1999.tb01552.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aim of the study was to investigate the in vitro antibiotic susceptibility of blood culture isolates after almost 20 years with ampicillin and methicillin as empirical treatment for neonatal septicaemia. All blood culture isolates and their antibiograms obtained in a single tertiary neonatal intensive care unit from 1 January 1989 to 31 December 1994 were reviewed. Two hundred and six blood cultures from 181 infants containing 223 bacterial and 11 fungal isolates were identified during 4416 admissions. Fifteen (6.7%) of the bacterial isolates were resistant to ampicillin and netilmicin. Fourteen per cent of the staphylococcal spp. were susceptible to penicillin while more than 90% were susceptible to netilmicin. The coagulase-negative staphylococci (CONS) were resistant to netilmicin, methicillin and gentamicin in 12%, 49% and 65%, respectively. Eighty-nine per cent of the methicillin-resistant CONS were susceptible to netilmicin as opposed to 17% to gentamicin (p<0.001). Except for one strain of Acinetobacter sp., all Gram-negative bacteria were susceptible to netilmicin. Our data show that the ampicillin-netilmicin combination still provides a high in vitro coverage (93%) against bacteria identified in blood cultures from newborns in our unit. Netilmicin has a significantly better in vitro effectiveness against CONS than gentamicin.
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Affiliation(s)
- A Rønnestad
- Department of Paediatrics, The National Hospital, Oslo, Norway
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Harbarth S, Rohner P, Safran E, Garbino J, Auckenthaler R, Pittet D. Resistance to amikacin and gentamicin among Gram-negative bloodstream isolates in a university hospital between 1989 and 1994. Clin Microbiol Infect 1998; 4:199-204. [PMID: 11864326 DOI: 10.1111/j.1469-0691.1998.tb00669.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE: To characterize antimicrobial resistance patterns to amikacin (AN) and gentamicin (GM) among Gram-negative bloodstream isolates and to determine the possible relationship between use of AN and GM and the occurrence of antibiotic resistance during a 6-year period. METHODS: Standard media and techniques of isolation and identification were used. Antimicrobial susceptibility testing was performed with the disk diffusion method and API rapid ATB E strips. Data on consumption of aminoglycosides were collected by the central hospital pharmacy and were expressed as daily defined doses. RESULTS: One thousand nine hundred and four bloodstream isolates were tested for AN and GM susceptibility between 1989 and 1994. Activities of AN and GM remained high during the study period against most isolates of Gram-negative bacteria. No relationship could be observed between the use of AN/GM and the rate of AN/GM resistance. Nosocomial Gram-negative bloodstream isolates showed a higher degree of resistance towards both AN (3.9% of all nosocomial isolates) and GM (7.9%) than community-acquired isolates (1.8% toward AN and 3.1% towards GM, respectively). There was a significant increase (P=0.004) in the risk of GM resistance in patients with nosocomial Gram-negative bacteremia detected more than 14 days after admission. The proportion of GM-susceptible Pseudomonas aeruginosa isolates decreased linearly from 97% for infections acquired between day 3 and day 10 following admission to 80% for bacteremia developing 30 days or more after admission (P=0.008). CONCLUSIONS: AN and GM remain highly active antimicrobial drugs for treatment of GNB in times of growing resistance to cephalosporins and fluoroquinolones.
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22
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Digranes A, Solberg CO, Sjursen H, Skovlund E, Sander J. Antibiotic susceptibility of blood culture isolates of Enterobacteriaceae from six Norwegian hospitals 1991-1992. APMIS 1997; 105:854-60. [PMID: 9393556 DOI: 10.1111/j.1699-0463.1997.tb05094.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
From August 1991 to February 1992, each of the six largest hospitals throughout Norway collected 84 to 107 consecutive blood culture isolates of Enterobacteriaceae, altogether 571 isolates. The distribution of various species and genera at the different hospitals was uniform; Escherichia coli being most prevalent (57-67%), followed by Klebsiella spp. (12-18%) and Proteus mirabilis (7-11%). Twenty-one and 4% of E. coli isolates were resistant to ampicillin and cefuroxime, respectively, and 11% of Klebsiella isolates were cefuroxime resistant. Five Enterobacter isolates and one Citrobacter isolate were resistant to ceftazidime, and one Salmonella isolate was resistant to imipenem. All isolates were susceptible to ciprofloxacin and tobramycin. These results were compared with the antibiotic consumption in each hospital region. Although hospitals in the regions with the highest consumption of ampicillin tended to have a higher percentage of isolates resistant to this agent, no significant differences were found. There was no significant difference between hospitals regarding prevalence of cefuroxime-resistant isolates.
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Affiliation(s)
- A Digranes
- Department of Microbiology and Immunology, Gade Institute, Haukeland Hospital, Bergen, Norway
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23
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Abstract
All cases of neonatal septicaemia during 1981-94 were studied at Orebro Medical Centre Hospital, Sweden. One hundred and thirty-two children fulfilled laboratory and clinical criteria for neonatal septicaemia and were included. Staphylococcus aureus (n = 41), Group B streptococcus (GBS) (n = 32) and coagulase-negative staphylococci (CoNS) (n = 27) were the dominating aetiologies. The annual incidence of septicaemia increased significantly, from 2.3 cases during the first 7-year period to 3.3 per 1000 live births during 1988-94. This increase was caused by S. aureus and CoNS, which mainly affected premature children and had an onset more than 48 h after delivery. GBS, on the other hand, slightly decreased and affected full-term children within 48 h. The overall mortality was 11%. CoNS isolated during the latter 7-year period were more resistant to antibiotics than those isolated during 1981-87; resistance to methicillin increased from 14 to 45% and to gentamicin from 0 to 20%. These changes in aetiology and antibiotic susceptibility should be considered when selecting antibiotic treatment in neonatal septicaemia.
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Affiliation(s)
- J Källman
- Department of Infectious Diseases, Orebro Medical Centre Hospital, Sweden
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24
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Sanders WE, Sanders CC. Enterobacter spp.: pathogens poised to flourish at the turn of the century. Clin Microbiol Rev 1997; 10:220-41. [PMID: 9105752 PMCID: PMC172917 DOI: 10.1128/cmr.10.2.220] [Citation(s) in RCA: 352] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Knowledge of the genus Enterobacter and its role in human disease has expanded exponentially in recent years. The incidence of infection in the hospital and the community has increased. New clinical syndromes have been recognized. Enterobacter spp. have also been implicated as causes of other syndromes that traditionally have been associated almost exclusively with more easily treatable pathogens, such as group A streptococci and staphylococci. Rapid emergence of multiple-drug resistance has been documented in individual patients during therapy and in populations and environments with strong selective pressure from antimicrobial agents, especially the cephalosporins. Therapeutic options for patients infected with multiply resistant strains have become severely limited. Carbapenems or, alternatively, fluoroquinolones are the most predictively active options, although resistance to both classes has been observed on rare occasions. Enterobacter spp. appear well adapted for survival and even proliferation as the turn of the century approaches.
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Affiliation(s)
- W E Sanders
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska 68178, USA
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25
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Hobson RP, MacKenzie FM, Gould IM. An outbreak of multiply-resistant Klebsiella pneumoniae in the Grampian region of Scotland. J Hosp Infect 1996; 33:249-62. [PMID: 8864938 DOI: 10.1016/s0195-6701(96)90011-0] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A predominantly hospital-based outbreak of multiply-resistant Klebsiella pneumoniae capsular type K2 (MRK) expressing expanded spectrum betalactamase (ESBL) activity and fully sensitive only to the carbapenems and amikacin is described. The organism was isolated from 283 patients between March 1992 and September 1995. The outbreak started in the intensive care unit (ICU) of a major acute hospital and spread through surgical wards, a medical ward, a geriatric unit in a separate hospital and various other local hospitals. Environmental screening revealed extensive ward contamination. The decline of the outbreak after the spring of 1995 coincided with the re-emphasis of standard infection control procedures and the launch of a works programme aimed at addressing underlying sites of environmental contamination. Of the 283 cases, 166 (59.0%) were detected through a specially instigated case finding programme. The MRK caused 11 cases of septicaemia, two postoperative intra-abdominal abscesses, one case of postoperative meningitis, 102 cases of urinary tract infection and 28 wound infections and was isolated from the respiratory tracts of five patients with ventilator associated pneumonia. The difficulty in controlling the outbreak is ascribed to heavy environmental contamination, frequent inter- and intra-hospital patient transfers and prolonged carriage of the outbreak strain.
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Affiliation(s)
- R P Hobson
- Department of Medical Microbiology, Aberdeen Royal Infirmary, Foresterhill, UK
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26
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Busch-SØRensen C, SØNmezoglu M, Frimodt-MØLler N, HØJbjerg T, Miller GH, Espersen F. Aminoglycoside resistance mechanisms inEnterobacteriaceaeandPseudomonasspp. from two Danish hospitals: correlation with type of aminoglycoside used. APMIS 1996. [DOI: 10.1111/j.1699-0463.1996.tb04940.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Giamarellou H, Tsapogas P, Pefanis A, Donta I, Perdikaris G, Karayiannakos P. Ciprofloxacin and imipenem alone or in combination in experimental aortic valve endocarditis due to a ciprofloxacin borderline susceptible strain of Pseudomonas aeruginosa. Int J Antimicrob Agents 1996; 7:23-8. [DOI: 10.1016/0924-8579(96)00005-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/1996] [Indexed: 10/18/2022]
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28
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Schwocho LR, Schaffner CP, Miller GH, Hare RS, Shaw KJ. Cloning and characterization of a 3-N-aminoglycoside acetyltransferase gene, aac(3)-Ib, from Pseudomonas aeruginosa. Antimicrob Agents Chemother 1995; 39:1790-6. [PMID: 7486920 PMCID: PMC162827 DOI: 10.1128/aac.39.8.1790] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A novel gene encoding an aminoglycoside 3-N-acetyltransferase, which confers resistance to gentamicin, astromicin, and sisomicin, was cloned from Pseudomonas aeruginosa Stone 130. Its sequence was determined and found to show considerable similarity to an aac(3)-I gene previously cloned from R plasmids from Enterobacter, Pseudomonas, and Serratia spp. We have designated the genes from the R plasmids and this work aac(3)-Ia and aac(3)-Ib, respectively. The two aac(3)-I genes share 74% nucleotide identity, and their deduced protein products are 88% similar. These data suggest that the genes derive from a common ancestor. Homology between the flanking sequences of both aac(3)-I genes and other resistance determinants known to reside in integron environments was also observed. Intragenic probes specific for either aac(3)-Ia or aac(3)-Ib were used in hybridization studies with a series of gentamicin-, astromicin-, and sisomicin-resistant clinical isolates. Of 59 clinical isolates tested, no isolates hybridized with both probes, 30 (51%) hybridized with the aac(3)-Ia probe, 12 (20%) hybridized with the aac(3)-Ib probe, and 17 (29%) did not hybridize with either probe. These data suggest the existence of at least one other aac(3)-I gene.
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Affiliation(s)
- L R Schwocho
- Schering-Plough Research Institute, Kenilworth, New Jersey 07033, USA
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29
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30
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Les limites de l'antibiothérapie locale dans le traitement de l'infection ostéo-articulaire. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 1994. [DOI: 10.1007/bf01803651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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31
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Development of amikacin resistance in bacterial isolates in Slovakia (1990–1992). Int J Antimicrob Agents 1994; 4:69-71. [DOI: 10.1016/0924-8579(94)90064-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/1993] [Indexed: 11/24/2022]
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32
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Kresken M, Hafner D, Mittermayer H, Verbist L, Bergogne-Bérézin E, Giamarellou H, Esposito S, van Klingeren B, Kayser FH, Reeves DS. Prevalence of fluoroquinolone resistance in Europe. Study Group 'Bacterial Resistance' of the Paul-Ehrlich-Society for Chemotherapy e. V. Infection 1994; 22 Suppl 2:S90-8. [PMID: 7927836 DOI: 10.1007/bf01793572] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Since 1984, when the first fluoroquinolone, norfloxacin, was marketed in Europe, there has been a marked increase in the usage of this class of drugs. In order to evaluate the influence of this drug usage on the prevalence of resistance to fluoroquinolones in clinical isolates of the family Enterobacteriaceae, Pseudomonas aeruginosa, Staphylococcus aureus, coagulase-negative staphylococci and Enterococcus faecalis we reviewed the susceptibility data from four collaborative surveys conducted between 1983 and 1990 by the Study Group 'Bacterial Resistance' of the Paul-Ehrlich-Society for Chemotherapy. All participating laboratories used the same standardized methods. Minimal inhibitory concentrations were determined by the broth microdilution method. More than 20,000 bacterial strains were tested. The results are presented for ciprofloxacin, which is regarded as the representative of the fluoroquinolones. Using > or = 4 mg/l as a breakpoint for resistance to ciprofloxacin, the prevalence of resistant strains of the family Enterobacteriaceae in Central Europe between 1983 and 1990 remained below 1%. In contrast, the resistance rates in P. aeruginosa were 0.7%, 1.0%, 3.8% and 7.0%, in S. aureus 0%, 0.5%, 6.6% and 6.8%, and in E. faecalis 2.2%, 0.7%, 4.9% and 7.7% in 1983, 1986, 1989 and 1990, respectively. The latest study carried out in cooperation with 78 laboratories from 12 European countries revealed great differences in the prevalence of resistance to fluoroquinolones from one species to another ranging from 0% with Proteus vulgaris and Salmonella spp. to 26.7% with Providencia stuartii.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M Kresken
- Rhône-Poulenc Rorer GmbH, Köln, Germany
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33
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Legakis NJ, Tzouvelekis LS, Tsakris A, Legakis JN, Vatopoulos AC. On the incidence of antibiotic resistance among aerobic gram-negative rods isolated in Greek hospitals. J Hosp Infect 1993; 24:233-7. [PMID: 8104213 DOI: 10.1016/0195-6701(93)90052-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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34
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Vanhoof R, Godard C, Nulens E, Nyssen HJ, Wildemauwe C, Hubrechts JM, Maes P, Hannecart-Pokorni E. Serotypes and extended spectrum beta-lactam resistance in aminoglycoside resistant Pseudomonas aeruginosa isolates from two Belgian general hospitals: a seven year study. J Hosp Infect 1993; 24:129-38. [PMID: 8104976 DOI: 10.1016/0195-6701(93)90075-b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A total of 1896 isolates of Pseudomonas aeruginosa resistant to aminoglycosides and isolated during the period 1983-1989 in two Belgian general hospitals were included in this study. The most frequently encountered O serotypes were O4, O11, O12 and non-typable isolates. The majority of the isolates showed resistance to extended spectrum beta-lactam antibiotics (cefotaxime, ceftriaxone and cefepime). However, a low degree of resistance was found for ceftazidime. By contrast, amikacin and isepamicin, remained active on a significant number of aminoglycoside resistant isolates. In both hospitals, impermeability and AAC(3)II enzyme production were the most prevalent aminoglycoside resistance mechanisms. There were marked differences between the two hospitals with regard to the distribution of the O-serotypes and resistance profiles.
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Affiliation(s)
- R Vanhoof
- Unit of Antibiotic Research, Institute Pasteur of Brabant, Brussels, Belgium
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35
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Fernandez-Rodriguez A, Canton R, Perez-Diaz JC, Martinez-Beltran J, Picazo JJ, Baquero F. Aminoglycoside-modifying enzymes in clinical isolates harboring extended-spectrum beta-lactamases. Antimicrob Agents Chemother 1992; 36:2536-8. [PMID: 1489200 PMCID: PMC284369 DOI: 10.1128/aac.36.11.2536] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The aminoglycoside-modifying enzymes present in the first 120 clinical isolates harboring extended-spectrum beta-lactamases isolated in Spain were studied. Most of these isolates (84%) were gentamicin resistant. The enzymes most frequently associated and cotransferred with SHV-2 or TEM-type beta-lactamases were AAC(3)V, APH(3"), and APH(3')I.
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36
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Vatopoulos AC, Tsakris A, Tzouvelekis LS, Legakis NJ, Pitt TL, Miller GH, Shaw KJ, Antreou M, Nikolopoulou M, Komninou Z. Diversity of aminoglycoside resistance in Enterobacter cloacae in Greece. Eur J Clin Microbiol Infect Dis 1992; 11:131-8. [PMID: 1327784 DOI: 10.1007/bf01967064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Ninety Enterobacter cloacae strains isolated from 12 Greek hospitals were examined in terms of epidemiological types and resistance mechanisms. Using O serotyping 69% of the strains were assigned to a specific serotype and overall 16 different serotypes were identified. The combination of serotyping, phagetyping and biotyping efficiently discriminated most of the strains, indicating that single epidemic strains were not prevalent, although serotypes 3, 7, and group II predominated. Eight representative strains, all resistant to gentamicin, tobramycin, amikacin and netilmicin, were further examined for transferability and mechanisms of resistance. Aminoglycoside resistance was found to be transferable in most strains, and 13 R plasmids of 40-120 MDa molecular weight were detected. The enzymes detected consisted of three enzymes active against gentamicin [ANT(2h'), AAC(3)-I and AAC(3)-V]; three active against tobramycin [ANT(2"), AAC(3)-V and AAC(6')-I]; two active against netilmicin [AAC(3)-V and AAC(6')-I]; and one active against amikacin [AAC(6')-I]. APH(3') and ANT (3"), which modify neomycin and streptomycin plus spectinomycin respectively, were also found. Overall up to five aminoglycoside modifying enzymes were detected on the same R plasmid, AAC(6')-I plus ANT(2") being the most prevalent. The high incidence of multiresistance in Enterobacter cloacae and the fact that resistance is due to enzymatic inactivation of the antibiotics, indicate that in Greece this species might act as a gene pool for the spread of resistance to other bacteria of clinical relevance.
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Affiliation(s)
- A C Vatopoulos
- Department of Microbiology, Hippokration General Hospital, Athens, Greece
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37
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Maes P, Vanhoof R. A 56-month prospective surveillance study on the epidemiology of aminoglycoside resistance in a Belgian general hospital. SCANDINAVIAN JOURNAL OF INFECTIOUS DISEASES 1992; 24:495-501. [PMID: 1411316 DOI: 10.3109/00365549209052636] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this survey, we studied the effect of extensive amikacin usage on the epidemiology of aminoglycoside resistance in a general hospital. The baseline resistance in the 12 months before amikacin was 5.8% for amikacin, 15.2% for gentamicin, 16.4% for tobramycin and 14.0% for netilmicin. During the following 44 months, amikacin was the aminoglycoside of first choice. In the first 2 years of this phase, resistance to amikacin did not change significantly. Later, amikacin resistance rose significantly, mainly due to the introduction of amikacin-resistant Enterobacter aerogenes strains. In general there was a significant decrease in resistance to gentamicin and tobramycin. Resistance mechanisms were examined in 380 strains. AAC(3)V, and AAC(6')I alone or coupled with ANT(2") or AAC(3) were the most prevalent enzymes. In the amikacin phase, we noticed a significant increase of strains harbouring the AAC(6')I enzyme, while strains with the AAC(3)V were less frequently isolated. Strains with permeability resistance did not become more prevalent during the period of extensive amikacin use.
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Affiliation(s)
- P Maes
- St-Jozefkliniek, Afdeling Microbiologie, Oostende, Belgium
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38
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Chomarat M, Vital MG, Flandrois JP. Susceptibility to aminoglycosides of 63 strains of Stomatococcus mucilaginosus isolated from sputum. ZENTRALBLATT FUR BAKTERIOLOGIE : INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY 1991; 276:63-7. [PMID: 1789902 DOI: 10.1016/s0934-8840(11)80219-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The MIC of 63 Stomatococcus mucilaginosus for 7 aminoglycosides was determined. Most of the strains were resistant to these antibiotics except to streptomycin. A natural resistance due to impermeability may be involved. One single strain was resistant to all these aminoglycosides where the concentration level of streptomycin was greater than 1000 mg/l. A chromosomal mutation is probably involved.
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Affiliation(s)
- M Chomarat
- Laboratoire de Bactériologie, Centre Hospitalier Lyon-Sud, Pierre-Bénite, France
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