IFNG and tuberculosis: The distribution of genotypic and allelic frequencies of IFN-γ +874 A/T SNP in TB patients and healthy controls was not statistically significant (OR, 1.56; 95% CI [0.31–7.82]; p = 0.587) and (OR, 2.27; 95% CI [0.61–8.15]; p = 0.227).