title: [Evolution of the epidemic process in viral hepatitis in Leningrad in the last 30 years].
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000453:epidemiology* / Q000266:history; D006506:Hepatitis A / Q000453:epidemiology* / Q000266:history; D006801:Humans; D012426:Russia; D012621:Seasons; D014505:Urban Population
vernacular_title: Evoliutsiia épidemicheskogo protsessa virusnogo gepatita v Leningrade za 30 let.