title: Antigenic analysis of recent influenza A(H1N1) viruses.
mesh_terms: D000818:Animals; D000956:Antigens, Viral / Q000032:analysis*; D005289:Ferrets / Q000276:immunology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D009980:Influenza A virus / Q000145:classification / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D007252:Influenza Vaccines