Viral hepatitis.
D000328:Adult; D002648:Child; D006506:Hepatitis A / Q000517:prevention & control; D006509:Hepatitis B / Q000517:prevention & control; D006526:Hepatitis C / Q000517:prevention & control; D006525:Hepatitis, Viral, Human / Q000517:prevention & control*; D006801:Humans; D007114:Immunization; D007223:Infant; D014944:World Health Organization