we tested the activity of piperacillin against 491 bacterial local clinical isolates in comparison with ampicillin , mezlocillin , cefazolin , cefoperazone , cefotaxime , ceftazidime , moxalactam , and gentamicin , using an agar dilution technique and inocula of 10 ( 6 ) and 10 ( 4 ) colony forming units .
C0002680
ampicillin
C0025893
mezlocillin