News & Perspective

Oct 12, 2001

Oct 12, 2001

Interferon assay for latent TB may be more specific than skin test

(CIDRAP News) – Comparison of an interferon-gamma (IFN-gamma) assay for latent tuberculosis infection (LTBI) with the standard tuberculin skin test (TST) suggests that the interferon assay is less likely to produce false-positive results in people with prior BCG vaccination or reactivity to nontuberculous mycobacteria, according to a report in the Journal of the American Medical Association.