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Molecular Characterization of Resistance to Mupirocin in Methicillin-Susceptible and -Resistant Isolates of Staphylococcus aureus from Nasal Samples

Servicio de Microbiología, Hospital Universitario Doce de Octubre, Avenida de Cordoba sn, 28041 Madrid, Spain

Received 13 May 2003/ Returned for modification 7 July 2003/ Accepted 8 November 2003

A total of 15 of 101 (14.8%) nasal methicillin-resistant Staphylococcus aureus (MRSA) isolates exhibited mupirocin resistance (Mup^r) compared with 1 of 154 (0.6%) methicillin-susceptible Staphylococcus aureus isolates. A total of 14 (93%) isolates exhibiting high-level Mup^r belonged to a single clone. Horizontal plasmid transfer and transmission of Mup^r strains contribute to a high incidence of Mup^r MRSA at our institution.

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