title: Current knowledge of multiple sclerosis.
mesh_terms: D000818:Animals; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology* / Q000276:immunology / Q000628:therapy; D012756:Sheep; D014777:Virus Diseases / Q000276:immunology; D014780:Viruses / Q000302:isolation & purification; D014790:Visna-maedi virus