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Investigation of methicillin-resistant Staphylococcus aureus showing reduced vancomycin susceptibility isolated from a patient with infective endocarditis |
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| Authors: | Takayama Yoko Hanaki Hideaki Irinoda Kazuhiko Kokubun Hideya Yoshida Kazunari Sunakawa Keisuke |
| Affiliation: | a Department of Infectious Diseases, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan b Department of Microbiology, Kitasato University School of Medicine, Sagamihara, Japan c Department of Pharmacy, Kitasato University Hospital, Sagamihara, Japan d Department of Urology, Kitasato University School of Medicine, Sagamihara, Japan |
| Abstract: | A patient with infective endocarditis (IE) caused by methicillin-resistant Staphylococcus aureus (MRSA) was treated with vancomycin (VAN). VAN was ineffective, although therapeutic drug monitoring (TDM) indicated that the recommended trough level was maintained. Five MRSA isolates obtained at various times were analyzed to determine the minimum inhibitory concentration (MIC) and were subjected to population analysis, simulation analysis pulsed-field gel electrophoresis (PFGE). MRSA susceptible to VAN was isolated before and during the early stage of treatment, while an MRSA strain showing reduced VAN MIC was isolated during treatment. Simulation analysis indicated that the viable bacterial count only decreased to 10−3 to 10−4 cells after 72 h of incubation. The five MRSA strains isolated at various times were identical by PFGE. |
| Keywords: | Vancomycin Susceptibility MRSA MRSA Therapeutic drug monitoring Infective endocarditis |
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