Misclassification of Susceptible Strains of Staphylococcus aureus as Methicillin-Resistant S. aureus by a Rapid Automated Susceptibility Testing System
AUTOR(ES)
Ribeiro, Julival
FONTE
American Society for Microbiology
RESUMO
Eight Staphylococcus aureus strains initially identified by Vitek GPS-BS or GPS-SA cards as resistant to oxacillin, but susceptible to most non-beta-lactam antibiotics, were found on further testing to be susceptible to oxacillin and ceftizoxime by disk diffusion tests. For all these strains, the MICs of oxacillin were ≤0.5 μg/ml by agar dilution tests, and the strains were oxacillin susceptible when tested by the BBL Crystal MRSA ID and a Vitek machine with GPS-101 cards. None grew on oxacillin-salt agar screening plates. None were positive for mecA gene sequences by PCR. When S. aureus strains tested by Vitek GPS-SA or GPS-BS cards appear resistant to only penicillin and oxacillin, a confirmatory test such as the oxacillin-salt agar screening method should be performed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=84854Documentos Relacionados
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