title: Isolation of a recombinant influenza virus (Hsw 1 N2) from swine in Japan.
abstract: Outbreaks of swine influenza were first observed in Japan in 1978. A number of influenza viruses were isolated from diseased swine. Almost all viruses isolated were swine influenza virus (Hsw 1 N1) but two viruses isolated from the nasal swabs of swine showing clinical signs of influenza in the Kanagawa prefecture were characterized antigenically as Hsw 1 N2. Analysis of swine sera showed that influenza virus Hsw 1 N2 was epidemic in the farm from which the virus had been isolated. The new virus (Hsw 1 N2) seems to have been produced by recombination between swine influenza virus (Hsw 1 N1) and Hong Kong influenza virus (H3N2).
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D009980:Influenza A virus / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification; D009976:Orthomyxoviridae Infections / Q000382:microbiology*; D011995:Recombination, Genetic; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology*
chemical_list: D000914:Antibodies, Viral