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Accuracy of phenotypic methicillin susceptibility methods in the detection of Staphylococcus aureus isolates carrying different SCCmec types.
Matos, Pricilla D M de; Schuenck, Ricardo P; Cavalcante, Fernanda S; Caboclo, Roberta M F; Santos, Kátia Regina N dos.
Affiliation
  • Matos PD; Departamento de Microbiologia Médica, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
Mem Inst Oswaldo Cruz ; 105(7): 931-4, 2010 Nov.
Article in En | MEDLINE | ID: mdl-21120367
ABSTRACT
A total of 138 isolates, 118 methicillin-resistant Staphylococcus aureus (MRSA) isolates (staphylococcal cassette chromosome type II, 20 isolates, type III, 39 isolates and type IV, 59 isolates) and 20 methicillin-sensitive S. aureus isolates were evaluated by phenotypic

methods:

cefoxitin and oxacillin disk diffusion (DD), agar dilution (AD), latex agglutination (LA), oxacillin agar screening (OAS) and chromogenic agar detection. All methods showed 100% specificity, but only the DD tests presented 100% sensitivity. The sensitivity of the other tests ranged from 82.2% (OAS)-98.3% (AD). The LA test showed the second lowest sensitivity (86.4%). The DD test showed high accuracy in the detection of MRSA isolates, but there was low precision in the detection of type IV isolates by the other tests, indicating that the genotypic characteristics of the isolates should be considered.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Oxacillin / Staphylococcus aureus / Cefoxitin / Methicillin Resistance / Anti-Bacterial Agents Type of study: Diagnostic_studies Limits: Humans Language: En Journal: Mem Inst Oswaldo Cruz Year: 2010 Document type: Article Affiliation country: Brazil

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Oxacillin / Staphylococcus aureus / Cefoxitin / Methicillin Resistance / Anti-Bacterial Agents Type of study: Diagnostic_studies Limits: Humans Language: En Journal: Mem Inst Oswaldo Cruz Year: 2010 Document type: Article Affiliation country: Brazil
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