title: In-vitro susceptibility of Nocardia asteroides to 21 beta-lactam antibiotics, in combination with three beta-lactamase inhibitors, and its relationship to the beta-lactamase content.
abstract: Twelve strains of Nocardia asteroides were studied for their susceptibility to 21 beta-lactam antibiotics, alone or in combination with clavulanic acid, sulbactam, or BLP 2013, and for their content of beta-lactamase. Eleven strains were shown to have beta-lactamase activities, which gave three different patterns after analytical isoelectric focusing. The only strain with no detectable beta-lactamase was the most susceptible to the antibiotics tested. The other strains containing beta-lactamases showed almost the same susceptibility profile. Clavulanic acid was the only beta-lactamase inhibitor to show a significant synergistic effect when combined with penicillins.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D019818:Clavulanic Acid; D002969:Clavulanic Acids / Q000494:pharmacology; D004357:Drug Synergism; D008826:Microbial Sensitivity Tests; D009616:Nocardia asteroides / Q000187:drug effects* / Q000201:enzymology; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; D002969:Clavulanic Acids; D065093:beta-Lactamase Inhibitors; D019818:Clavulanic Acid; D001618:beta-Lactamases