[Trends in research of the development, chronicity, and cellular immunity of viral hepatitis].
D002908:Chronic Disease; D006506:Hepatitis A / Q000276:immunology; D006509:Hepatitis B / Q000276:immunology; D006526:Hepatitis C / Q000276:immunology; D006525:Hepatitis, Viral, Human / Q000276:immunology*; D006801:Humans; D007111:Immunity, Cellular