title: [A seroepidemiological study of hepatitis A viral infection].
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002681:China; D005260:Female; D006506:Hepatitis A / Q000453:epidemiology*; D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies / Q000032:analysis; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged
chemical_list: D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies