1887

Abstract

The prevalence of influenza C virus among pigs in Hyogo Prefecture, Japan, was investigated by serological techniques. Out of 240 sera tested, 45 (19%) showed haemagglutination inhibition (HI) to influenza C virus. Pig sera with high HI titres also scored high in neutralization tests and ELISAs. When fractionated by sucrose density gradient ultracentrifugation, the HI/ELISA reactivities corresponded to antibodies of the IgM and IgG classes. Radioimmunoprecipitation tests revealed that some, but not all, of the pig sera with high HI activities precipitated HEF glycoprotein of influenza C virus. These results suggested that the HI activities of pig sera in Hyogo Prefecture were due to the presence of antibody to influenza C virus. Sera with IgM class antibody to influenza C virus were found throughout the year. However, the question of whether or not pigs serve as a natural reservoir for human influenza C virus still remains to be solved.

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1991-03-01
2024-12-04
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