title: In vitro activity of piperacillin, ticarcillin, mezlocillin, ticarcillin-clavulanic acid, aztreonam, ceftazidime, azlocillin, cefoperazone, and thienamycin against Pseudomonas aeruginosa.
abstract: The in vitro susceptibility of 103 well-characterized strains of Pseudomonas aeruginosa to nine antimicrobial agents was assessed by means of the Kirby-Bauer disk diffusion assay and the microtiter minimal inhibitory concentration assay. The antimicrobials, from the most to the least active against P aeruginosa, were thienamycin greater than ceftazidime greater than piperacillin greater than azlocillin greater than cefoperazone greater than aztreonam greater than ticarcillin greater than ticarcillin-clavulanic acid greater than mezlocillin. The resistance patterns of the antimicrobial agents suggest that P aeruginosa resistant to a penicillin, cephalosporin, or aztreonam may be susceptible to thienamycin.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001390:Azlocillin / Q000494:pharmacology; D001398:Aztreonam / Q000494:pharmacology; D002438:Cefoperazone / Q000494:pharmacology; D002442:Ceftazidime / Q000494:pharmacology; D019818:Clavulanic Acid; D002969:Clavulanic Acids / Q000494:pharmacology; D004338:Drug Combinations; D008802:Mezlocillin / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010878:Piperacillin / Q000494:pharmacology; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D013845:Thienamycins / Q000494:pharmacology; D013982:Ticarcillin / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D002969:Clavulanic Acids; D004338:Drug Combinations; D013845:Thienamycins; D019818:Clavulanic Acid; D002438:Cefoperazone; D002442:Ceftazidime; D013982:Ticarcillin; D001398:Aztreonam; D001390:Azlocillin; D008802:Mezlocillin; C015537:thienamycin; D010878:Piperacillin