For co-infections with other viral hepatitis, MSM had statistically significantly lower seropositive rates of HBsAg (9.0%) and anti-HBc antibody (26.4%) than heterosexuals and IDUs, and higher percentages of positive anti-HBs antibodies than non-MSM groups (53.9% vs 47.7%, p = 0.053). Here, KRT88P is linked to coinfection.