title: [Survey on the possession of HI antibody against influenza virus in the aged and on the production of HI antibody after vaccination].
mesh_terms: D000328:Adult; D000368:Aged; D000956:Antigens, Viral / Q000032:analysis*; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology*; D008875:Middle Aged; D014611:Vaccination
chemical_list: D000956:Antigens, Viral; D007252:Influenza Vaccines