HLA-A and Dengue hemorrhagic fever: Two other alleles (HLA-A*01 and A*31: 3.1 fold decrease, P = 0.551) were found to be absent in the Chinese DHF patient group, while in the Indian DHF patient group HLA-A*33 (4.8 fold decrease, P = 0.549) and HLA-A*68 alleles were noted to be present at decreased levels (2.1 fold decrease, P = 0.658, 0R = 2.14, 95% CI = 0.23–19.97).