Chronic viral infections of the central nervous system.

Aleutian Mink Disease Amyotrophic Lateral Sclerosis/etiology Animals Brain Diseases/veterinary Central Nervous System Diseases/etiology,veterinary Chronic Disease Creutzfeldt-Jakob Syndrome/etiology Dementia/etiology Enterovirus B, Human/isolation & purification Humans Kuru/etiology Leukoencephalopathy, Progressive Multifocal/etiology Lymphocytic Choriomeningitis/veterinary Measles virus/isolation & purification Mink Multiple Sclerosis/etiology Papillomaviridae/isolation & purification Parkinson Disease/etiology Polyomaviridae Polyradiculopathy/etiology Scrapie Sheep Subacute Sclerosing Panencephalitis/etiology Virus Diseases/complications,veterinary