title: A small virus-like agent found in association with multiple sclerosis material.
mesh_terms: D000818:Animals; D006801:Humans; D051379:Mice; D009103:Multiple Sclerosis / Q000382:microbiology*; D009504:Neutrophils / Q000382:microbiology; D012608:Scrapie / Q000382:microbiology; D012756:Sheep; D014779:Virus Replication; D014780:Viruses / Q000302:isolation & purification*