Comparison of susceptibility testing methods with mecA gene analysis for determining oxacillin (Methicillin) resistance in clinical isolates of Staphylococcus aureus and coagulase-negative Staphylococcus spp

Ninety-nine clinical staphylococcal isolates (58 coagulase-negative Staphylococcus spp. [CoNS] and 41 Staphylococcus aureus isolates) were evaluated for susceptibility to oxacillin. The following susceptibility testing methods, media, and incubation conditions were studied: agar dilution by using Mu...

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Veröffentlicht in:Journal of clinical microbiology 1999-09, Vol.37 (9), p.2952-2961
Hauptverfasser: KOHNER, P, UHL, J, KOLBERT, C, PERSING, D, III, F. C
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container_issue 9
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creator KOHNER, P
UHL, J
KOLBERT, C
PERSING, D
III, F. C
description Ninety-nine clinical staphylococcal isolates (58 coagulase-negative Staphylococcus spp. [CoNS] and 41 Staphylococcus aureus isolates) were evaluated for susceptibility to oxacillin. The following susceptibility testing methods, media, and incubation conditions were studied: agar dilution by using Mueller-Hinton (MH) medium (Difco) supplemented with either 0, 2, or 4% NaCl and incubation at 30 or 35 degrees C in ambient air for 24 or 48 h; disk diffusion by using commercially prepared MH medium (Difco) and MH II agar (BBL) and incubation at 35 degrees C in ambient air for 24 or 48 h; and agar screen (spot or swab inoculation) by using commercially prepared agar (Remel) or MH agar (Difco) prepared in-house, each containing 4% NaCl and 6 microg of oxacillin/ml (0.6-microg/ml oxacillin was also studied with MH agar prepared in-house for the agar swab method and CoNS isolates) and incubation at 35 degrees C in ambient air for 24 or 48 h for swab inoculation and at 30 or 35 degrees C in ambient air for 24 or 48 h for spot inoculation. The results for these methods were compared to the results for mecA gene detection by a PCR method. Given the ability to support growth and the results for susceptibility testing (the breakpoint for susceptible isolates was
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C</creator><creatorcontrib>KOHNER, P ; UHL, J ; KOLBERT, C ; PERSING, D ; III, F. C</creatorcontrib><description>Ninety-nine clinical staphylococcal isolates (58 coagulase-negative Staphylococcus spp. [CoNS] and 41 Staphylococcus aureus isolates) were evaluated for susceptibility to oxacillin. The following susceptibility testing methods, media, and incubation conditions were studied: agar dilution by using Mueller-Hinton (MH) medium (Difco) supplemented with either 0, 2, or 4% NaCl and incubation at 30 or 35 degrees C in ambient air for 24 or 48 h; disk diffusion by using commercially prepared MH medium (Difco) and MH II agar (BBL) and incubation at 35 degrees C in ambient air for 24 or 48 h; and agar screen (spot or swab inoculation) by using commercially prepared agar (Remel) or MH agar (Difco) prepared in-house, each containing 4% NaCl and 6 microg of oxacillin/ml (0.6-microg/ml oxacillin was also studied with MH agar prepared in-house for the agar swab method and CoNS isolates) and incubation at 35 degrees C in ambient air for 24 or 48 h for swab inoculation and at 30 or 35 degrees C in ambient air for 24 or 48 h for spot inoculation. The results for these methods were compared to the results for mecA gene detection by a PCR method. Given the ability to support growth and the results for susceptibility testing (the breakpoint for susceptible isolates was &lt;/=2 microg/ml), the best methods for CoNS isolates were (i) agar dilution by using MH medium supplemented with 4% NaCl and incubation at 35 degrees C for 48 h (no growth failures were noted, and sensitivity was 97.6%) and (ii) agar screen (swab inoculation) by using MH medium prepared in-house supplemented with 4% NaCl and containing 0.6 microg oxacillin/ml and incubation at 35 degrees C for 48 h (one isolate that did not carry the mecA gene did not grow, and the sensitivity was 100%). All but one (agar dilution without added NaCl and incubation at 30 degrees C for 48 h) of the methods tested revealed all oxacillin-resistant S. aureus isolates, and no growth failures occurred with any method. If the breakpoint for susceptibility was lowered to &lt;/=1 microg/ml for agar dilution methods, more CoNS isolates with oxacillin resistance related to the mecA gene were detected when 0 or 2% NaCl agar supplementation was used. Only one CoNS isolate with mecA gene-associated resistance was not detected by using agar dilution and MH medium supplemented with 4% NaCl with incubation for 48 h. When the breakpoint for susceptibility was decreased 10-fold (from 6.0 to 0.6 microg of oxacillin per ml) for the agar swab screen method, fully 100% of the CoNS isolates that carried the mecA gene were identified.</description><identifier>ISSN: 0095-1137</identifier><identifier>EISSN: 1098-660X</identifier><identifier>DOI: 10.1128/jcm.37.9.2952-2961.1999</identifier><identifier>PMID: 10449481</identifier><identifier>CODEN: JCMIDW</identifier><language>eng</language><publisher>Washington, DC: American Society for Microbiology</publisher><subject>Antibacterial agents ; Antibiotics. 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C</creatorcontrib><title>Comparison of susceptibility testing methods with mecA gene analysis for determining oxacillin (Methicillin) resistance in clinical isolates of Staphylococcus aureus and coagulase-negative Staphylococcus spp</title><title>Journal of clinical microbiology</title><addtitle>J Clin Microbiol</addtitle><description>Ninety-nine clinical staphylococcal isolates (58 coagulase-negative Staphylococcus spp. [CoNS] and 41 Staphylococcus aureus isolates) were evaluated for susceptibility to oxacillin. The following susceptibility testing methods, media, and incubation conditions were studied: agar dilution by using Mueller-Hinton (MH) medium (Difco) supplemented with either 0, 2, or 4% NaCl and incubation at 30 or 35 degrees C in ambient air for 24 or 48 h; disk diffusion by using commercially prepared MH medium (Difco) and MH II agar (BBL) and incubation at 35 degrees C in ambient air for 24 or 48 h; and agar screen (spot or swab inoculation) by using commercially prepared agar (Remel) or MH agar (Difco) prepared in-house, each containing 4% NaCl and 6 microg of oxacillin/ml (0.6-microg/ml oxacillin was also studied with MH agar prepared in-house for the agar swab method and CoNS isolates) and incubation at 35 degrees C in ambient air for 24 or 48 h for swab inoculation and at 30 or 35 degrees C in ambient air for 24 or 48 h for spot inoculation. The results for these methods were compared to the results for mecA gene detection by a PCR method. Given the ability to support growth and the results for susceptibility testing (the breakpoint for susceptible isolates was &lt;/=2 microg/ml), the best methods for CoNS isolates were (i) agar dilution by using MH medium supplemented with 4% NaCl and incubation at 35 degrees C for 48 h (no growth failures were noted, and sensitivity was 97.6%) and (ii) agar screen (swab inoculation) by using MH medium prepared in-house supplemented with 4% NaCl and containing 0.6 microg oxacillin/ml and incubation at 35 degrees C for 48 h (one isolate that did not carry the mecA gene did not grow, and the sensitivity was 100%). All but one (agar dilution without added NaCl and incubation at 30 degrees C for 48 h) of the methods tested revealed all oxacillin-resistant S. aureus isolates, and no growth failures occurred with any method. If the breakpoint for susceptibility was lowered to &lt;/=1 microg/ml for agar dilution methods, more CoNS isolates with oxacillin resistance related to the mecA gene were detected when 0 or 2% NaCl agar supplementation was used. Only one CoNS isolate with mecA gene-associated resistance was not detected by using agar dilution and MH medium supplemented with 4% NaCl with incubation for 48 h. When the breakpoint for susceptibility was decreased 10-fold (from 6.0 to 0.6 microg of oxacillin per ml) for the agar swab screen method, fully 100% of the CoNS isolates that carried the mecA gene were identified.</description><subject>Antibacterial agents</subject><subject>Antibiotics. Antiinfectious agents. Antiparasitic agents</subject><subject>Bacterial Proteins - genetics</subject><subject>Bacteriology</subject><subject>Biological and medical sciences</subject><subject>Carrier Proteins - genetics</subject><subject>Coagulase - metabolism</subject><subject>Genes, Bacterial</subject><subject>Hexosyltransferases</subject><subject>Humans</subject><subject>Medical sciences</subject><subject>Microbial Sensitivity Tests - methods</subject><subject>Muramoylpentapeptide Carboxypeptidase - genetics</subject><subject>Oxacillin - pharmacology</subject><subject>Penicillin Resistance</subject><subject>Penicillin-Binding Proteins</subject><subject>Peptidyl Transferases</subject><subject>Pharmacology. 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C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of susceptibility testing methods with mecA gene analysis for determining oxacillin (Methicillin) resistance in clinical isolates of Staphylococcus aureus and coagulase-negative Staphylococcus spp</atitle><jtitle>Journal of clinical microbiology</jtitle><addtitle>J Clin Microbiol</addtitle><date>1999-09-01</date><risdate>1999</risdate><volume>37</volume><issue>9</issue><spage>2952</spage><epage>2961</epage><pages>2952-2961</pages><issn>0095-1137</issn><eissn>1098-660X</eissn><coden>JCMIDW</coden><abstract>Ninety-nine clinical staphylococcal isolates (58 coagulase-negative Staphylococcus spp. [CoNS] and 41 Staphylococcus aureus isolates) were evaluated for susceptibility to oxacillin. The following susceptibility testing methods, media, and incubation conditions were studied: agar dilution by using Mueller-Hinton (MH) medium (Difco) supplemented with either 0, 2, or 4% NaCl and incubation at 30 or 35 degrees C in ambient air for 24 or 48 h; disk diffusion by using commercially prepared MH medium (Difco) and MH II agar (BBL) and incubation at 35 degrees C in ambient air for 24 or 48 h; and agar screen (spot or swab inoculation) by using commercially prepared agar (Remel) or MH agar (Difco) prepared in-house, each containing 4% NaCl and 6 microg of oxacillin/ml (0.6-microg/ml oxacillin was also studied with MH agar prepared in-house for the agar swab method and CoNS isolates) and incubation at 35 degrees C in ambient air for 24 or 48 h for swab inoculation and at 30 or 35 degrees C in ambient air for 24 or 48 h for spot inoculation. The results for these methods were compared to the results for mecA gene detection by a PCR method. Given the ability to support growth and the results for susceptibility testing (the breakpoint for susceptible isolates was &lt;/=2 microg/ml), the best methods for CoNS isolates were (i) agar dilution by using MH medium supplemented with 4% NaCl and incubation at 35 degrees C for 48 h (no growth failures were noted, and sensitivity was 97.6%) and (ii) agar screen (swab inoculation) by using MH medium prepared in-house supplemented with 4% NaCl and containing 0.6 microg oxacillin/ml and incubation at 35 degrees C for 48 h (one isolate that did not carry the mecA gene did not grow, and the sensitivity was 100%). All but one (agar dilution without added NaCl and incubation at 30 degrees C for 48 h) of the methods tested revealed all oxacillin-resistant S. aureus isolates, and no growth failures occurred with any method. If the breakpoint for susceptibility was lowered to &lt;/=1 microg/ml for agar dilution methods, more CoNS isolates with oxacillin resistance related to the mecA gene were detected when 0 or 2% NaCl agar supplementation was used. Only one CoNS isolate with mecA gene-associated resistance was not detected by using agar dilution and MH medium supplemented with 4% NaCl with incubation for 48 h. When the breakpoint for susceptibility was decreased 10-fold (from 6.0 to 0.6 microg of oxacillin per ml) for the agar swab screen method, fully 100% of the CoNS isolates that carried the mecA gene were identified.</abstract><cop>Washington, DC</cop><pub>American Society for Microbiology</pub><pmid>10449481</pmid><doi>10.1128/jcm.37.9.2952-2961.1999</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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source American Society for Microbiology; MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central
subjects Antibacterial agents
Antibiotics. Antiinfectious agents. Antiparasitic agents
Bacterial Proteins - genetics
Bacteriology
Biological and medical sciences
Carrier Proteins - genetics
Coagulase - metabolism
Genes, Bacterial
Hexosyltransferases
Humans
Medical sciences
Microbial Sensitivity Tests - methods
Muramoylpentapeptide Carboxypeptidase - genetics
Oxacillin - pharmacology
Penicillin Resistance
Penicillin-Binding Proteins
Peptidyl Transferases
Pharmacology. Drug treatments
Sodium Chloride - pharmacology
Staphylococcus
Staphylococcus - drug effects
Staphylococcus aureus
Staphylococcus aureus - drug effects
title Comparison of susceptibility testing methods with mecA gene analysis for determining oxacillin (Methicillin) resistance in clinical isolates of Staphylococcus aureus and coagulase-negative Staphylococcus spp
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