IFNG and tuberculosis: An increased incidence of herpes virus infections as well as TB and NTM infections (e.g., M. bovis BCG) has been observed in patients with GOF STAT1 defect, and it was thought that the enhancement of signaling downstream to IFN-α/IFN-β and IFN-γ caused by GOF STAT1 mutations could lead to exhaustion of virus-specific T-cells and refractory response to IFN-γ.