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J Clin Microbiol. 2009 Nov;47(11):3765-8. doi: 10.1128/JCM.00934-09. Epub 2009 Sep 16.

Two distinct clones of methicillin-resistant Staphylococcus aureus (MRSA) with the same USA300 pulsed-field gel electrophoresis profile: a potential pitfall for identification of USA300 community-associated MRSA.

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  • 1National Center for Antimicrobials and Infection Control, Statens Serum Institut, B.47, Artillerivej 5, DK-2300 Copenhagen.

Abstract

Analysis of methicillin-resistant Staphylococcus aureus (MRSA) characterized as USA300 by pulsed-field gel electrophoresis identified two distinct clones. One was similar to community-associated USA300 MRSA (ST8-IVa, t008, and Panton-Valentine leukocidin positive). The second (ST8-IVa, t024, and PVL negative) had different molecular characteristics and epidemiology, suggesting independent evolution. We recommend spa typing and/or PCR to discriminate between the two clones.

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