Two commercial tests are available: the QuantiFERON®-TB Gold In-Tube (QFT-GIT) test (Cellestis Ltd, Carnegie, Australia), which uses ELISA to detect IFN-γ in the culture supernatant, and the T-SPOT®.TB (Oxford Immunotec, Abingdon, UK), which is based on the enzyme-linked immunospot (ELISpot) assay. This evidence concerns the gene IFNG and tuberculosis.