Our results indicated a significant difference in the UGT1A1*28/*6 allele gene frequency distribution in the post-hepatitis hyperbilirubinemia group compared with that in the hepatitis-control group, but there was no significant difference in UGT1A1*28/*6 gene polymorphisms between the GS and post-hepatitis hyperbilirubinemia groups. The gene discussed is UGT1A1; the disease is hepatitis A virus infection.