Possible Error-- Th1 cells release IFN gamma, not macrophages, See AMBOSS definition "An ELISA test that measures the level of interferon-γ expressed by T cells after coming into contact with Mycobacterium tuberculosis. Used to diagnose latent tuberculosis infection in at-risk populations. Elevated interferon-γ levels indicate a positive result. In contrast to tuberculin skin testing, there are no false-positive results with IGRA in patients who received the Bacillus Calmette-Guérin (BCG) vaccine. Commercially available, FDA-approved tests include the QuantFERON-TB Gold In-Tube assay and the T-SPOT.TB assay.
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