title: Swine flu outbreak. New details on virus's promiscuous past.
authors.forename: Jon
authors.initials: J
authors.lastname: Cohen
mesh_terms: D000818:Animals; D001717:Birds; D004196:Disease Outbreaks; D005814:Genes, Viral; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000145:classification / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification; D053122:Influenza A Virus, H3N2 Subtype / Q000235:genetics; D007252:Influenza Vaccines; D005585:Influenza in Birds / Q000821:virology; D007251:Influenza, Human / Q000453:epidemiology / Q000821:virology*; D008800:Mexico; D009976:Orthomyxoviridae Infections / Q000662:veterinary / Q000821:virology; D016865:Reassortant Viruses / Q000235:genetics; D011995:Recombination, Genetic; D013552:Swine; D013553:Swine Diseases / Q000821:virology; D014481:United States
chemical_list: D007252:Influenza Vaccines