IFNG and tuberculosis: The comparison of the allelic and genotypic frequencies of the IFNG +874A/T polymorphism between the TB and LTBI groups showed that the wild-type AA genotype (p = 0.0027; OR = 3.6104, 95% CI 1.36–9.60) and the A allele (p < 0.0001; OR = 2.1649, 95% CI 1.48–3.1) were more frequent in the TB group.