Test done for mycobacterium tuberculosis by whole blood is :: (A) BACTEC, (B) IGRA, (C) GeneXpe, (D) Culture
Answer is B. IGRA is interferon gamma release assay .In this test,we target up with the aificial intake of mycobacterium like ESAT-6,CFP-10,TB-7.7, by adding the sample blood(sensitized ) having T-cells which release interferon gamma and its activity can be measured. It is highly specific and there are no positive results.