HLA-DRB1 and pulmonary tuberculosis: Distribution of HLA-DRB and HLA-DQB alleles among pulmonary tuberculosis patients compared to household contacts: when we compared the distribution of the HLA-DRB and HLA-DQB alleles between the patients and HHCs before adjustment for HIV status, the frequency of the DRB5*2 allele was 23.5% higher among PTB patients compared to HHCS (p=0.013).