title: The follow-up study of swine and Hong Kong influenza virus infection among Japanese hogs.
abstract: Pigs in Miyagi Prefecture, Japan were examined for swine (Hssw1N1) and Hong Kong (H3N2) influenza virus infection by serological tests. The results obtained revealed that a swine influenza was prevalent with relatively high positive ratios throughout that time, and that the Hong Kong influenza virus closely related to a recent human epidemic strain, A/Yamanashi/2/77, also persisted, corresponding to a human endemic. These epidemiological findings strongly suggested the possibility of direct transmission of Hong Kong virus from humans to pigs and vice versa.
mesh_terms: D000818:Animals; D006385:Hemagglutination Inhibition Tests; D009980:Influenza A virus / Q000302:isolation & purification*; D009976:Orthomyxoviridae Infections / Q000382:microbiology / Q000662:veterinary*; D012621:Seasons; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology*