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J Med Microbiol 56 (2007), 43-46; DOI: 10.1099/jmm.0.46777-0
© 2007 Society for General Microbiology
ISSN 1473-5644

Evaluation of mannitol salt agar, CHROMagar Staph aureus and CHROMagar MRSA for detection of meticillin-resistant Staphylococcus aureus from nasal swab specimens

Zhuolin Han1, Ebbing Lautenbach1,2,3, Neil Fishman1,2 and Irving Nachamkin4

1 Department of Hospital Epidemiology and Infection Control, University of Pennsylvania School of Medicine, Philadelphia, PA, USA

2 Department of Medicine, Division of Infectious Diseases, University of Pennsylvania School of Medicine, Philadelphia, PA, USA

3 Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA

4 Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, USA

Correspondence
Irving Nachamkin
nachamki{at}mail.med.upenn.edu

Received 12 June 2006
Accepted 10 September 2006

Mannitol salt agar (MSA), CHROMagar Staph aureus (CSA) and CHROMagar MRSA (CSA-MRSA) were evaluated with nasal surveillance specimens for their ability to detect Staphylococcus aureus and meticillin-resistant S. aureus (MRSA). CSA was found to be more sensitive than MSA in detecting S. aureus (98 versus 84.3 %; P=0.03). CSA and CSA-MRSA were equivalent in the ability to detect MRSA at 24 h (89.7 versus 87.2 %) and at 48 h (94.9 versus 94.9 %). When combined with Staphaurex slide confirmation testing, both CSA and CSA-MRSA were highly specific (100 %) media for detecting MRSA from nasal swab specimens.

Abbreviations: CNS, coagulase-negative staphylococci; CSA, CHROMagar Staph aureus; CSA-MRSA, CHROMagar MRSA; MRSA, meticillin-resistant S. aureus; MSA, mannitol salt agar.




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