title: Molecular mechanism of acquisition of virulence in influenza virus in nature.
authors.affiliation: Department of Virology and Molecular Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38101.
authors.forename: Y
authors.initials: Y
authors.lastname: Kawaoka
authors.forename: R G
authors.initials: RG
authors.lastname: Webster
mesh_terms: D000818:Animals; D002645:Chickens; D006801:Humans; D009980:Influenza A virus / Q000235:genetics / Q000472:pathogenicity*; D007251:Influenza, Human / Q000453:epidemiology / Q000382:microbiology; D009975:Orthomyxoviridae / Q000472:pathogenicity; D014774:Virulence