title: Viral hepatitis--a primer: 1. Epidem.iology.
abstract: Hepatitis A is most often transmitted by the fecal-oral route under conditions of crowding, poor hygiene, and prolonged exposure to infected persons. Direct spread of hepatitis B via person-to person contact has only recently been proved. Hepatitis B is usually transmitted indirectly proved. Hepatitis B is usually transmitted indirectly by percutaneous routes, and the increase in drug abuse has brought about a change in its epidemiologic pattern.
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006506:Hepatitis A / Q000175:diagnosis / Q000453:epidemiology / Q000635:transmission*; D006515:Hepatitis B virus; D006507:Hepatovirus / Q000145:classification; D006801:Humans; D008297:Male; D011247:Pregnancy; D014481:United States