Measurements of IFN-γ are performed either by ELISpot-based assay (T-SPOT.TB, TS-TB, provided by Immunotech, UK) or ELISA [QuantiFERON TB Gold (QFT-G) and QFT-in-tube (QFT-IT), both provided by Cellestis, Australia]. This evidence concerns the gene IFNG and tuberculosis.