The SNPs in the IFN-γ gene region can influence the IFN-γ production, which may increase the risk of viral infection [9].The IFN-γ +874 T/A (rs2430561) in the first intron of the IFN-γ gene, in which the TT genotype produces a high level of IFN-γ, helps the host’s defense against viral infection. The gene discussed is IFNG; the disease is viral infectious disease.