IFNG and tuberculosis: As for IFN-γ, statistically significant differences were observed in QFT TB1 and QFT TB2 cultures between the HC and the LTBI groups (p<0.0001) as well as the TB and the LTBI cohorts (QFT TB1 p = 0.01; QFT TB2 p = 0.04) (Fig 2B).