"Causes, Antecedent History
Viral infections thought to induce ADEM include influenza virus, enterovirus, measles, mumps, rubella, varicella zoster, Epstein Barr virus, cytomegalovirus, herpes simplex virus, hepatitis A, and coxsackievirus; while the bacterial infections include Mycoplasma pneumoniae, Borrelia burgdorferi, Leptospira, and beta-hemolytic Streptococci[12]. The only vaccine proven to induce ADEM in the Semple form of the rabies vaccine, but hepatitis B, pertussis, diphtheria, measles, mumps, rubella, pneumococcus, varicella, influenza, Japanese encephalitis, and polio vaccines have all been implicated[13][14][15][6][16][17][18][19][20][21] [22]. In rare cases, ADEM seems to follow from organ transplantation[16]. The risk of ADEM from measels vaccination is about 1 to 2 per million[15], which is far lower than the risk of developing ADEM from an actual measels infection, which is about 1 per 1000 for measles (and 1 per 5000 for rubella)[23][17]. Measels infection also appears to lead to worse ADEM outcomes than cases associated with measels immunization. Some vacines, later shown to have been contaminated with host animal CNS tissue, have ADEM incident rates as high as 1 in 600[24]."
http://en.wikipedia.org/wiki/Acute_disseminated...
