title: Letter: Vaccine against swine influenza.
mesh_terms: D000328:Adult; D000917:Antibody Formation; D005260:Female; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D009975:Orthomyxoviridae / Q000276:immunology*
chemical_list: D007252:Influenza Vaccines