nineteen strains of staphylococcus aureus ( five penicillin-susceptible and methicillin-susceptible , four methicillin-susceptible and penicillin-resistant , and ten methicillin-resistant ) were serially subcultured in broth media containing a subinhibitory concentration ( half the mic ) of either teicoplanin or vancomycin .
C0030842
penicillin
C0025643
methicillin