[Detection of antibody to type B influenza virus in pig populations in China].
D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D002681:China; D009981:Influenza B virus / Q000276:immunology*; D012703:Serotyping; D013552:Swine / Q000276:immunology*
D000914:Antibodies, Viral