HLA-DRB1 and autoimmune hepatitis: HLA-DRB1*13 was a susceptibility allele for the occurrence of AIH in our population, in accordance Bittencourt et al [25] as they found that genetic susceptibility to AIH linked to HLA-DRB1*13 but, HLA-DRB1*03 allele was also found in the Brazilian population and indicated that different HLA antigens confer the susceptibility of AIH types I and II.