the antimicrobial activities of the cephalosporins cefazolin , cefotaxime , moxalactam or ceftazidime in combination with tobramycin against clinical isolates of e. coli , of klebsiella , of beta-lactamase-negative and beta-lactamase-producing s. aureus strains were compared in vitro by the checkerboard technique .
C3536856
cephalosporins
C0007559
ceftazidime