IFNG and tuberculosis: The recent description and availability of Interferon-gamma release assays (IGRA); the QuantiFERON®-TB Gold In-Tube (QF-TB-IT, Cellestis, Australia) and the T-SPOT TB (T-SPOT®, Oxford Immunotec Ltd. UK); offers new possibilities for the diagnosis of latent TB infection (LTBI) and active TB in adults [10].