IFNG and tuberculosis: These results demonstrated in our population that the combined genotypes profiles of IFNG+874T/A SNP (low IFNG+874AA, moderate IFNG+874AT, or high IFNG+874TT producers) and NOS2A-954G/C SNP (low NOS2A-954GG or moderate NOS2A-954GC producers) are not associated with the modulation of the production of nitrite and NOx− radicals in both TB patients and control group or in TST-positive control subgroup.