Distribution of Antibodies against Swine and Hong Kong Influenza Viruses among Pigs in 1977

Abstract

The distribution of antibodies against swine and Hong Kong influenza viruses among hogs in Miyagi Prefecture was examined. Of 456 serum specimens collected since July 1977, 12 were found to be positive against swine influenza virus and 6 against Hong Kong influenza virus. Such serological results reveal that swine and Hong Kong influenza viruses coexist in Japanese hogs and suggest thatt swine influenza virus reappeared in mid-1977.