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Low Concentrations of Mupirocin in the Pharynx following Intranasal Application May Contribute to Mupirocin Resistance in Methicillin-Resistant Staphylococcus aureus

By Hiroshi Watanabe, Hironori Masaki, Norichika Asoh, Kiwao Watanabe, Kazunori Oishi, Shinobu Kobayashi, Akiyoshi Sato, Rinya Sugita and Tsuyoshi Nagatake

Abstract

We describe a patient with methicillin-resistant Staphylococcus aureus (MRSA) colonizing the pharynx. The MIC of mupirocin was 0.25 μg/ml before treatment and increased after treatment to 8 μg/ml. Using pulsed-field gel electrophoresis, we confirmed that the genotypes of MRSA that colonized the pharynx before and after the use of mupirocin were identical. We measured the delivery of mupirocin to the pharynx in three normal volunteers and two patients. Low concentrations of mupirocin were present in the pharynx in all cases 10 min to 3 days after intranasal application. Our data suggested that low concentrations of the drug in the pharynx after intranasal application of mupirocin ointment might explain the selection of mupirocin resistance in MRSA

Topics: Bacteriology
Publisher: American Society for Microbiology
Year: 2001
DOI identifier: 10.1128/JCM.39.10.3775-3777.2001
OAI identifier: oai:pubmedcentral.nih.gov:88432
Provided by: PubMed Central
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