Extensive serologies were negative to hepatitis A, hepatitis B, hepatitis C (including hepatitis C RNA), hepatitis E, IgM to cytomegalovirus and Epstein-Barr virus, anti-nuclear antibody, anti-smooth muscle antibody, anti-mitochondrial antibody, anti-liver kidney microsomal antibody, and ceruloplasmin. The gene discussed is CP; the disease is hepatitis A virus infection.