title: Seroepidemiological studies of pandemic influenza A (H1N1) 2009 virus.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000914:Antibodies, Viral / Q000097:blood; D002648:Child; D002675:Child, Preschool; D003429:Cross Reactions; D004196:Disease Outbreaks; D014943:Global Health; D006801:Humans; D007223:Infant; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology*; D008875:Middle Aged; D015995:Prevalence; D016036:Seroepidemiologic Studies; D055815:Young Adult
chemical_list: D000914:Antibodies, Viral