Capilia test for identification of Mycobacterium tuberculosis in MGIT™-positive cultures
OBJECTIVE: To assess the diagnostic yield of the Capilia test in the rapid identification of MTC in MGIT-positive cultures.
DESIGN: A total of 459 selected sputum samples were cultured using BACTEC™ MGIT™ 960. Tubes flagged positive by the MGIT instrument (MGIT-positive) were examined for acid-fast bacilli and cording in smears, spotted on blood agar (BA), subcultured for biochemical tests and tested using the Capilia test. Based on smear and growth on BA, MGIT-positive tubes were grouped into MGIT true-positive, MGIT-positive with contamination and MGIT contamination. Performance parameters of Capilia test such as sensitivity, specificity, efficiency, and positive and negative predictive values (PPV, NPV) for each of these groups were determined against biochemical tests as gold standard.
RESULTS: Of the 346 MGIT-positives, respectively 233, 73 and 40 were MGIT true-positive, MGIT-positive with contamination and MGIT contamination. For the three groups, the PPV and NPV of the Capilia test were respectively 97%, 96% and 100%, and 32%, 27% and 60%.
CONCLUSION: In settings with high contamination of MGIT cultures, the performance of the Capilia test is diminished.
Document Type: Research Article
Publication date: 2012-06-01
The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.
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