title: Absence of hemagglutinating encephalomyelitis virus in Finnish elite breeding pig herds.
mesh_terms: D000818:Animals; D003332:Coronaviridae / Q000276:immunology*; D004682:Encephalomyelitis, Enzootic Porcine / Q000453:epidemiology / Q000382:microbiology*; D005387:Finland; D006385:Hemagglutination Inhibition Tests; D006387:Hemagglutination, Viral; D013552:Swine / Q000382:microbiology*