VDR and pulmonary tuberculosis: A study conducted by AIIMS and RBIPMT hospital in New Delhi examined 897 subjects from northern India to investigate the relationship between VDR polymorphisms and serum 25(OH)D levels with susceptibility to, and response to treatment of, multidrug-resistant TB (MDR-TB) in comparison to drug-susceptible pulmonary TB (DS-PTB) and healthy controls.