IFNG and tuberculosis: QF-TB-IT IFNγ values were significantly lower at day 180 as compared to day 0 (p = 0.041, paired Wilcoxon rank test) (figure 5), however, as for LTBI patients, the numbers of patients with positive QF-TB-IT values (≥0.35 IU/ml) at day 0 and day 180 were not significantly different (21 out of 25 [84%] vs18 out of 25 [72%], p = 0.51, Liddell test).