Viral hepatitis: morbidity trends.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006506:Hepatitis A / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D014481:United States