title: Multicenter evaluation of Bactec MGIT 960 system for second-line drug susceptibility testing of Mycobacterium tuberculosis complex.
abstract: The Bactec MGIT 960 system for testing susceptibility to second-line drugs was evaluated with 117 clinical strains in a multicenter study. The four drugs studied were levofloxacin, amikacin, capreomycin, and ethionamide. The critical concentration established for levofloxacin and amikacin was 1.5 microg/ml, that established for capreomycin was 3.0 microg/ml, and that established for ethionamide was 5.0 microg/ml. The overall level of agreement between the agar proportion method and the MGIT 960 system was 96.4%, and the levels of agreement for the individuals drugs were 99.1% for levofloxacin, 100% for amikacin, 97.4% for capreomycin, and 88.9% for ethionamide. The rate of reproducibility of the drug susceptibility testing results between the participating laboratories was 99.5%.
authors.affiliation: Microbial Diseases Laboratory, CDPH, 850 Marina Bay Parkway, Richmond, CA 94804, USA. grace.lin@cdph.ca.gov
authors.forename: S-Y Grace
authors.initials: SY
authors.lastname: Lin
authors.forename: Edward
authors.initials: E
authors.lastname: Desmond
authors.forename: Donald
authors.initials: D
authors.lastname: Bonato
authors.forename: Wendy
authors.initials: W
authors.lastname: Gross
authors.forename: Salman
authors.initials: S
authors.lastname: Siddiqi
mesh_terms: D000583:Amikacin / Q000494:pharmacology; D000995:Antitubercular Agents / Q000494:pharmacology*; D002207:Capreomycin / Q000494:pharmacology; D005000:Ethionamide / Q000494:pharmacology; D006801:Humans; D064704:Levofloxacin; D008826:Microbial Sensitivity Tests / Q000379:methods*; D009169:Mycobacterium tuberculosis / Q000187:drug effects* / Q000302:isolation & purification; D015242:Ofloxacin / Q000494:pharmacology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014376:Tuberculosis / Q000382:microbiology
chemical_list: D000995:Antitubercular Agents; D002207:Capreomycin; D064704:Levofloxacin; D000583:Amikacin; D015242:Ofloxacin; D005000:Ethionamide