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Kill curves for four strains of methicillin-resistant S. aureus (MRSA) for which both drugs were bactericidal (A) vancomycin was bactericidal but quinupristin-dalfopristin (Quin/Dalfo) was not (B); quinupristin-dalfopristin was bactericidal but vancomycin was not (C); and neither drug was bactericidal (D).
