Leads from the MMWR. Hepatitis--1984.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D006506:Hepatitis A / Q000453:epidemiology; D006509:Hepatitis B / Q000453:epidemiology; D006525:Hepatitis, Viral, Human / Q000453:epidemiology*; D006801:Humans; D011159:Population Surveillance; D014481:United States