Vaccine can cause autism (Gerber and Offit, 2009; Baker, 2008) and also, aggravate a low �chemical� tolerance individual causing him to have autistic behaviours. A low chemical tolerance refers to the state of the body whereby the presence of heavy metals or other chemicals can induce symptoms.
References
Baker, J. (2008) �Mercury, Vaccines, and Autism: One Controversy, Three Histories�,
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