The worldwide increase in the diagnosis of autism and autistic spectrum disorder (ASD) together with increasing reports of a regressive onset has caused many to argue that the condition should no longer be viewed as solely, or even mainly, genetic in origin, environmental factors must be implicated, particularly those of bacterial or viral genesis.
Pathogenic substances entering the bloodstream of developing children merit consideration and investigation in the search for causation.
The witness and evidence of parents may provide persuasive clues...
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