title: Neuromyelitis optica: severe demyelination occurring years after primary smallpox vaccination.
mesh_terms: D000293:Adolescent; D001921:Brain / Q000382:microbiology; D002555:Cerebrospinal Fluid / Q000382:microbiology; D005260:Female; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology*; D012899:Smallpox / Q000517:prevention & control*; D014611:Vaccination / Q000009:adverse effects*; D014616:Vaccinia virus / Q000302:isolation & purification