Prevalence of Hong Kong (H3N2) influenza virus-antibody in swine.

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Abstract
To elucidate Hong Kong (H3N2) influenza virus infection in swine population, a serological survey was conducted on 3701 swine sera collected at an abattoir in Obihiro, Hokkaido, Japan, during 1980-1983. The swine sera possessing antibodies to corresponding current epidemic strains were 14.7% in 1980, 3.9% in 1981 and 7.1% in 1982 between June and Sept. in each year. In 1983, a high prevalence (31.4%) of the antibodies was observed from March to July. These results suggest that the swine were infected with the human influenza virus as piglets in the first 3 yr, and as adults in the last year, throughout an epidemic of human influenza virus infection which occurred among the human populations during the period from Jan. to March in these years.