HLA-DRB1 and infection: In this study, we have found that human leucocyte antigen alleles A*24 in 22.87%, HLAC*02 in 4.52%, and HLA DQA1*02 in 27.74% of RTRs were significantly associated with asymptomatic infection, whereas HLA alleles HLA B*13 in 4.62%, DRB1*10 in 4.62%, DRB*15 in 39.30%, DRB1*30 in 1.15%, and DQA1*60 in 3.57% of patients were associated with symptomatic infection.