IFNG and tuberculosis: In supplemental analyses, the number of baseline IFN-γ responses to mycobacterial antigens remained significantly associated with the hazard of HIV-associated TB both among subjects with a negative baseline TST (HR 0.42, 95% CI 0.21-0.84, P = 0.014) and among subjects with a positive baseline TST (HR 0.58, 95% CI 0.39−0.87, P = 0.008).