This is underscored by the clinical association between HIV and TB, by the genetic susceptibility to TB and opportunistic mycobacterial disease of individuals bearing mutations in the IL-12/IL-23–IFN-γ pathway and by the increased risk to develop reactivation TB of individuals treated with anti-TNF-α agents used for a range of inflammatory/autoimmune diseases, such as rheumatoid arthritis and Crohn’s disease [9,10,11]. Here, IFNG is linked to tuberculosis.