such test revealed beta-lactamase production in 54 strains out of 116 ( 46 % ) : mics of eight beta-lactam antibiotics ( ampicillin , piperacillin , cefazoline , cephaloridine , cephalexine , cefuroxime , cefotaxime , cefotaxime ) were determined using a miniaturized dilution broth method .
C0002680
ampicillin
C0031955
piperacillin