IFNG and tuberculosis: The TBAg IFN-γ levels were significantly higher in the active TB group (4.66 [1.51–8.90] IU/mL) than in the IGRA-positive non-TB (2.35 [1.01–6.22] IU/mL) and IGRA-negative non-TB (0.10 [0.06–0.18] IU/mL) groups (P < 0.0001).