Viruses and chronic neurological diseases.
D000818:Animals; D001921:Brain / Q000002:abnormalities; D002415:Cats; D002417:Cattle; D002493:Central Nervous System Diseases / Q000209:etiology*; D002908:Chronic Disease; D007562:Creutzfeldt-Jakob Syndrome / Q000209:etiology; D006224:Cricetinae; D003711:Demyelinating Diseases / Q000209:etiology; D006801:Humans; D006832:Hydranencephaly / Q000209:etiology; D006849:Hydrocephalus / Q000209:etiology; D007968:Leukoencephalopathy, Progressive Multifocal / Q000209:etiology; D051379:Mice; D012608:Scrapie / Q000209:etiology; D012756:Sheep; D014777:Virus Diseases