Test done for Mycobacterium tuberculosis based on CMI is

Ref. Textbook of Microbiology and Immunology BY Parija. Page. 350   IGRA IGRAs measure a person’s immune reactivity to M. tuberculosis. White blood cells from most persons that have been infected with M. tuberculosis will release interferon-gamma (IFN-g) when mixed with antigens (substances that can produce an immune response) derived from M. tuberculosis. Types of IGRA QuantiFERON TB Gold In-Tube test (QFT-GIT); T-SPOT.TB test (T-Spot)