title: [Seroepizootiological studies on type A influenza virus against porcine serum in Tochigi Prefecture over a period from July, 1979 to June, 1980].
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D009980:Influenza A virus / Q000276:immunology*; D007564:Japan; D009976:Orthomyxoviridae Infections / Q000453:epidemiology / Q000662:veterinary*; D013552:Swine / Q000276:immunology*; D013553:Swine Diseases / Q000453:epidemiology*
chemical_list: D000914:Antibodies, Viral