1985 Volume 47 Issue 4 Pages 633-638
In order to elucidate Hong Kong (H3N2) influenza virus infection in swine population, a serological survey was conducted on a total of 3, 701 swine sera collected at an abattoir in Obihiro, Hokkaido during the years 1980 to 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 September in each year. In 1983, however, 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 three years, 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 January to March in these years.
