the most active antimicrobial agents were piperacillin and minocycline , followed ( in descending order of activity ) by moxalactam , erythromycin , cefoperazone , tetracycline , ampicillin , cefotaxime , chloramphenicol , josamycin , sulfamethoxazole , and nalidixic acid .
C1136254
antimicrobial agents
C0039644
tetracycline