Journal Article

Evaluation of a Whole-Blood Interferon-γ Release Assay for the Detection of <i>Mycobacterium tuberculosis</i> Infection in 2 Study Populations

Bahrie Bellete, Jacqueline Coberly, Grace Link Barnes, Chiew Ko, Richard E. Chaisson, George W. Comstock and William R. Bishai

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 34, issue 11, pages 1449-1456
Published in print June 2002 | ISSN: 1058-4838
Published online June 2002 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/340397
Evaluation of a Whole-Blood Interferon-γ Release Assay for the Detection of Mycobacterium tuberculosis Infection in 2 Study Populations

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A whole-blood interferon-γ release assay (IGRA) is being evaluated for its potential to replace the tuberculin skin test (TST) for detecting Mycobacterium tuberculosis infection. To test the assay in a population in which tuberculosis is highly endemic and in another population that is representative of an urban United States population, 253 volunteers from Ethiopia and 175 volunteers from Baltimore were studied for responsiveness on IGRA compared with a simultaneously performed TST. The agreement between the 2 tests, beyond that due to chance, was 68% among subjects from Baltimore and only 35% among those from Ethiopia. IGRA had a sensitivity of 71%, compared with 95% sensitivity for the TST, among 21 subjects who had undergone treatment for culture-confirmed tuberculosis. The specificity was 85% for IGRA and 96% for TST among 52 subjects with no known history of exposure to tuberculosis. In its current form, with purified protein derivative used as the stimulation antigen, the IGRA was found to perform poorly in comparison to the TST in diagnosing M. tuberculosis infection.

(See the editorial commentary by Nadal on pages 1457–9.)

Journal Article.  4760 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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