The median serum IFN-γ concentrations in each group was similar, at 2.65 (IQR 0.00–42.2), 3.73 (IQR 0.00–14.7), 3.72 (IQR 0.93–82.5), and 1.81 (1.1–15.5) in the TB, LTBI, NMP and HC groups, respectively (Fig 1B). This evidence concerns the gene IFNG and tuberculosis.