title: Relationship between prevalence of antibody to hepatitis A antigen and age: a cohort effect?
mesh_terms: D000293:Adolescent; D000328:Adult; D000375:Aging; D000914:Antibodies, Viral; D002648:Child; D006507:Hepatovirus / Q000276:immunology*; D006801:Humans; D008875:Middle Aged
chemical_list: D000914:Antibodies, Viral