HLA-DRB1 and infection: The HLA-II alleles such as DRB1*03:01, DRB1*04:01, DRB1*07:01, DRB1*09:01, DRB1*11:01, and DRB1*13:02 predisposed to DHF following infection with all the three serotypes (Table S2A in Supplementary Material).