IFNG and tuberculosis: On average, the magnitude of IFN-γ response decreased with increasing TTP in individuals with definite TB, however, this did not reach significance [p-value; Spearman’s rank correlation coefficient (rS)] for TSPOT.TB (0.11; −0.14), QFT-GIT (0.07; −0.16) or PPD ELISPOT (0.09; −0.15) (Figure 2).