Autistic conditions can result from acute disseminated encephalomyelitis (ADEM) following MMR vaccination as held by the US Federal Court in the case of Bailey Banks. In his conclusion, US Federal Court Special Master Abell ruled that Petitioners had proven that the MMR had directly caused a brain inflammation illness called acute disseminated encephalomyelitis (ADEM) which, in turn, had caused the autism spectrum disorder PDD-NOS in the child:
The Court found that Bailey’s ADEM was both caused-in-fact and proximately caused by his vaccination. It is well-understood that the vaccination at issue can cause ADEM, and the Court found, based upon a full reading and hearing of the pertinent facts in this case, that it did actually cause the ADEM. Furthermore, Bailey’s ADEM was severe enough to cause lasting, residual damage, and retarded his developmental progress, which fits under the generalized heading of Pervasive Developmental Delay, or PDD [an autism spectrum disorder]. The Court found that Bailey would not have suffered this delay but for the administration of the MMR vaccine, and that this chain of causation was… a proximate sequence of cause and effect leading inexorably from vaccination to Pervasive Developmental Delay.
[Banks v. HHS (Case 02-0738V, 2007 U.S. Claims LEXIS 254, July 20, 2007)].