T cell interferon gamma (IFN-γ) release assays (IGRAs) are now used to diagnose latent TB infection (LTBI) [7–9]and include a whole-blood gamma interferon (IFN-γ) enzyme-linked immunosorbent assay (FERQuanti ON-TB Gold in-tube (QFT-G); Cellestis Ltd, Victoria, Australia) and an enzyme-linked immunospot (ELISPOT) assay (T-SPOT.TB; Oxford Immunotec, Oxfordshire, United Kingdom). This evidence concerns the gene IFNG and tuberculosis.