title: The vitro efficacy of beta-lactam and beta-lactamase inhibitors against multidrug resistant clinical strains of Mycobacterium tuberculosis.
abstract: In vitro activity of beta-lactam antibiotics and their beta-lactamase inhibitor combinations were evaluated for their activity against clinical isolates of Mycobacterium tuberculosis and M. tuberculosis H37Ra. Agar dilution, the BACTEC 460 system and beta-lactamase activity tests were used. Results using the BACTEC 460 and enzyme activity tests showed the best beta-lactamase inhibitor for M. tuberculosis H37Ra to be clavulanic acid. Cefazolin-clavulanic acid gave the lowest minimal inhibitory concentration (MIC) values using dilution tests and M. tuberculosis H37Ra. beta-Lactam antibiotics were combined with clavulanic acid and tested for in vitro activity against 50 selected multidrug-resistant (MDR) and 50 susceptible clinical isolates. Seventy-four percent of the isolates were inhibited by cefazolin-clavulanic acid combination. These results suggested that an appropriate combination of beta-lactam and beta-lactamase inhibitors might be useful in the treatment of tuberculosis due to multidrug-resistant strains.
authors.affiliation: Department of Microbiology and Clinical Microbiology, School of Medicine, Hacettepe University, Ankara, Turkey.
authors.forename: Irem
authors.initials: I
authors.lastname: Dinçer
authors.forename: Alper
authors.initials: A
authors.lastname: Ergin
authors.forename: Tanil
authors.initials: T
authors.lastname: Kocagöz
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D019818:Clavulanic Acid / Q000494:pharmacology; D003470:Culture Media; D024901:Drug Resistance, Multiple, Bacterial; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D009169:Mycobacterium tuberculosis / Q000187:drug effects* / Q000254:growth & development; D018088:Tuberculosis, Multidrug-Resistant / Q000382:microbiology; D014397:Tuberculosis, Pulmonary / Q000382:microbiology; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D004791:Enzyme Inhibitors; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams; D019818:Clavulanic Acid