Abstract

Summary Confirmation was obtained of the occurrence in Italy in 1976 of an epizootic of classical swine influenza in pigs. Confirmation was based on the isolation of influenza virus strains showing a close antigenic relationship with both classical influenza A/Swine/ Iowa/30 (Hsw 1 N1) virus and A / New Jersey / 8 / 76 virus; a rise in antibody titer in sera obtained during the acute and convalescent stages of illness; and a high incidence of HI antibodies in tests with A / New Jersey virus (Hsw 1 N1) and a very low incidence in tests with influenza A/Victoria/3/75 (H3 N2) virus on 1330 sera from 46 farms in the province of Mantova (North Italy). Zusammenfassung Bericht uber das Auftreten klassischer Schweineinfluenza in Italien im Jahre 1976 Das epizootische Auftreten klassischer Schweineinfluenza in Schweinen wurde in Italien bestatigt. Diese Bestatigung basiert auf den folgenden Ergebnissen: a) Isolierung von Influenzastammen mit naher antigenetischer Verwandtschaft zu den klassischen Influenzastammen A/Swine/Iowa/30 (HSwl/ N1) und A / New Jersey J 8 / 76. b) Anstieg der Antikorpertiter in Schweineseren wahrend der akuten Krankheitsphase und in der Konvaleszenzphase. c) Haufiger Nachweis von Antikorpern im HAH-Test gegen das A / New Jersey-Virus (HSw1/N1) sowie sehr seltener Nachweis von Antikorpern gegen Influenza A/Victoria/3/75 (H3/N2) in 1330 Seren von 46 Farmen der Provinz Mantua/Norditalien.

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