VDR and tuberculosis: Two of the most well-studied VDR polymorphisms indicated that neither Taq1 nor Fok1 restriction enzymes alone was associated with serum vitamin D levels; however, the finding that 6.6% and 12%, (OR = 0.53; 95% CI, 0.31–0.88; P = 0.01), of the TB case and control patients, respectively, carried the VDR-tt genotype indicated that homozygosity of the t allele was associated with clinical resistance to the disease [78].