Just a comment from someone with entirely too much experience -- the spectrum of autism is wide, our knowledge of its causes is spit-shallow. Many studies are flawed or outright dishonest, but a growing body of good evidence does suggest that for some people, vaccinations do cause problems. (And I am in NO way advocating skipping them). The question is why? Autoimmune malfunction --and autism---is a gun loaded by genetics with environment pulling the trigger. The task is to figure out how to tell who is walking around with a "loaded gun".