because of the need for non-beta-lactam antimicrobics with antistaphylococcal activity , 14 antimicrobics ( 3 penicillinase-resistant penicillins , 7 aminocyclitols [ 5 new ] , 2 macrolides [ 1 new ] , clindamycin , and a new polysaccharide , everninomicin ) were tested in vitro for activity against 22 penicillin-susceptible , 51 penicillin-resistant , and 47 methicillin-resistant strains of staphylococcus aureus .
C0282215
beta-lactam
C0030842
penicillin