each of 10 ampicillin- and/or cephalothin-resistant strains of e. coli , klebsiella , enterobacter and serratia were investigated against 6 penicillins ( penicillin g , ampicillin , ticarcillin , mezlocillin , azlocillin , bay k 4999 ) and 6 cephalosporins ( cefoxitin , cefuroxime , cefamandol , cephalothin , cefazolin , cefradine ) .
C0002680
ampicillin
C0025893
mezlocillin