Abstract

Isolates of community-associated meticillin-resistant Staphylococcus aureus (CA-MRSA), vancomycin-intermediate S. aureus (VISA), vancomycin-resistant S. aureus (VRSA) and daptomycin non-susceptible S. aureus (DNSSA) are increasing in frequency and new antistaphylococcal therapies are needed. Microdilution testing using Mueller–Hinton broth was used to determine the minimal inhibitory concentrations (MICs) of oritavancin and nine additional antimicrobial agents against 92 CA-MRSA, 23 VISA, 7 DNSSA and 10 VRSA isolates. Minimal bactericidal concentrations were also determined. Pulsed-field gel electrophoresis (PFGE) was performed. Staphylococcal cassette chromosome mec (SCC mec) typing as well as assays for Panton–Valentine leukocidin (PVL) and arginine catabolic mobile element (ACME) genes were performed. Oritavancin was more bactericidal than any of the other comparators against CA-MRSA and demonstrated excellent activity against VRSA and VISA.

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