Detectable levels of IFNγ were more frequently observed in patients with sarcoidosis (21/27:78 %) than patients with TB (5/22:23 %; p < 0.0001; Fisher's exact test) and HCs (2/32:6 %; p < 0.0001; Fisher's exact test) (Fig. 2A). This evidence concerns the gene IFNG and tuberculosis.