title: [Comparative study of 3 tests for susceptibility of Mycobacterium tuberculosis to first-line antituberculous drugs].
abstract: Treatment of tuberculosis requires a multidrug regimen for a prolonged period of time (6-12 months), which leads to a high level of noncompliance with therapy. This lack of compliance has led to an increase in drug-resistant strains of Mycobacterium tuberculosis. Rapid drug susceptibility tests are needed to assess effective chemotherapy regimens. In the present study, the reliability of ESP Myco System II(R) and E-test(R) for determining the susceptibility of 82 clinical isolates of M. tuberculosis to rifampin, isoniazid, streptomycin and ethambutol was evaluated by comparing results to those of the multiple proportion method as a reference. ESP Myco System II(R) is a nonradioactive, totally automated, continuously monitored system designed to detect grown mycobacteria. E-test(R) is a well-described method of susceptibility testing which provides data on minimal inhibitory concentration. The susceptibility results of both methods were available within 9 days, while those of the proportion method required 28 days. Levels of agreement between ESP Myco System II(R) and the proportion method for the clinical isolates analyzed were 100% for rifampin, isoniazid and ethambutol. Only one discrepancy was found for streptomycin. For the E-test(R), the results were less favorable. ESP Myco System II(R) was shown to be a rapid and reliable method for testing susceptibility of M. tuberculosis isolates. Nevertheless, E-test(R) provided low specificity for streptomycin and ethambutol. Further studies to test the reliability of the E-test(R) are necessary.
authors.affiliation: Servicio de Microbiología, Hospital General Universitario, Murcia.
authors.forename: M A
authors.initials: MA
authors.lastname: Delás
authors.forename: C
authors.initials: C
authors.lastname: Martínez
authors.forename: C
authors.initials: C
authors.lastname: Yagüe
authors.forename: T
authors.initials: T
authors.lastname: Rodríguez
authors.forename: T
authors.initials: T
authors.lastname: Rodríguez
authors.forename: M
authors.initials: M
authors.lastname: Segovia
mesh_terms: D000995:Antitubercular Agents / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D009169:Mycobacterium tuberculosis / Q000187:drug effects*
chemical_list: D000995:Antitubercular Agents