IFNG and tuberculosis: Recently, IFN-gamma releasing assays (IGRAs) such as the T-SPOT.TB assay and QuantiFERON-TB in-tube (QFT-GIT) have given promising results for diagnosis of latent TB infection6 and active TB.7–9 Our group has also demonstrated that the T-SPOT.TB assay may be a useful adjunctive test for various types of extrapulmonary TB.10–13 However, little is known about the usefulness of these assays for diagnosing disseminated TB.