we used strains of streptococci and gram negative rods tested versus 11 antibiotics : penicillin ( p ) , ampicillin ( am ) , carbenicillin ( cb ) , cefalotin ( cth ) , cefazolin ( cfz ) , cefradin ( cfa ) , cefoxitin ( cxt ) , cefotaxime ( ctx ) , erythromycin ( e ) , pristinamycin ( pr ) , vancomycin ( v ) .
C0030842
penicillin
C0006976
carbenicillin