title: Outbreak of mucosal disease among apparently immunotolerant heifers.
abstract: An outbreak of mucosal disease that occurred among Friesian heifers aged 15 to 18 months is described as it occurred. Investigation suggested that many heifers were immunotolerant to bovine virus diarrhoea-mucosal disease virus. Serious losses were incurred. The present policy of surveillance is described.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000453:epidemiology* / Q000276:immunology; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D001908:Diarrhea Viruses, Bovine Viral / Q000276:immunology; D004196:Disease Outbreaks / Q000453:epidemiology / Q000662:veterinary*; D005260:Female; D007108:Immune Tolerance; D006113:United Kingdom
chemical_list: D000914:Antibodies, Viral