Viral hepatitis.
D000328:Adult; D002648:Child; D006506:Hepatitis A / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control / Q000635:transmission; D006509:Hepatitis B / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control / Q000628:therapy; D006525:Hepatitis, Viral, Human; D006801:Humans