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Here is the Canadian Pediatrics Society position statement on Autism and its relationship to vaccines.
http://www.cps.ca/english/statements...note_Jun07.htm

Although immunization is known to provide effective life-saving benefits for children, it has sometimes been blamed for an array of diseases that have unknown causes (eg, autistic spectrum disorder [ASD], multiple sclerosis and sudden infant death syndrome). This is not surprising, given that immunizations are common and that humans are primed to attribute causality to events that precede an incident. We all use the ‘after it, because of it’ logic. This is how we learned not to touch a hot stove as young children. Unfortunately, this logic can be faulty. Causality assessment requires careful consideration of a wide range of factors. Beyond the temporal relationship, the consistency of the finding, the strength of the association, the specificity of the association and the biological plausibility, all need to be evaluated before attributing causality (1,2). The present article reviews recent controversies surrounding immunizations and ASD, and concludes that there are no data to support any association between immunization and ASD

An important factor to consider is what has happened to autism rates since the removal of thimerosal from vaccines. In studies from Canada (25), Denmark (20) and the United States (26) the rates of autism have continued to increase despite removal of thimerosal from vaccines.

There is mounting evidence (27) that ASD has a strong genetic component – a very plausible cause for the disorder