Comment: How do you know for certain

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In reply to comment: If you check out the Autisim rate.. (see in situ)

How do you know for certain

How do you know for certain vaccinations have anything to do with increased reports of autism. As I understand it, the definition of autism has expanded and that has had the net effect of increased use of prescription drugs to treat this so-called "epidemic" of autism.

Seems more logical that the "increase" is driven by big pharma sales than an autistic population rise.