In recent reviews by Perrillo et al14 and Loomba and Liang,15 HBsAg‐positive/HBc antibody‐positive patients with inflammatory bowel disease, vasculitis, sarcoidosis and autoimmune disease who were treated with corticosteroids over 4 weeks at moderate (10‐20 mg/d prednisone or equivalent) or high doses (more than 20 mg/d prednisone or equivalent), were reported to be at a moderate or high risk of reactivation of HBV, the incidence of which was 1%‐10% or more than 10% of cases. The gene discussed is KRT88P; the disease is vasculitis.