title: Human influenza A viruses in pigs: isolation of a H3N2 strain antigenically related to A/England/42/72 and evidence for continuous circulation of human viruses in the pig population.
abstract: An influenza virus strain isolated in Northern Italy in 1977 was identified as belonging to the H3N2 subtype (A/swine/Italy/1850/77). A close antigenic relationship to the human strain A/England/42/72 was demonstrated. Serologic surveys of 548 pig sera from 53 farms in two provinces in Northern Italy demonstrated the existence of antibodies to the swine/Italy/1850/77 strain and to A/Hong Kong/1/68, A/Victoria/3/75 and H 1 N 1 (Hsw 1 N 1) strains in the pig population.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D000956:Antigens, Viral / Q000276:immunology; D000939:Epitopes; D006385:Hemagglutination Inhibition Tests; D053122:Influenza A Virus, H3N2 Subtype; D009980:Influenza A virus / Q000145:classification / Q000276:immunology / Q000302:isolation & purification*; D007558:Italy; D009439:Neuraminidase / Q000276:immunology; D009976:Orthomyxoviridae Infections / Q000382:microbiology / Q000662:veterinary*; D012703:Serotyping; D013552:Swine / Q000382:microbiology; D013553:Swine Diseases / Q000382:microbiology*
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D000939:Epitopes; D009439:Neuraminidase