What causes regressive autism?

Our son is 10 yrs old; non verbal autistic.I agree with you 100%.Tell this to the unconvinced; Why is the rate of autism much lower for the Amish? Answer...no shots.Why is there any mercury in the shots? So the med. and pharmaceutical people can make another 50 cents off our kids? These people are from the depths of Hell; they will always deny what they have done.Even the gov't helped protect the drug mfgs from lawsuits.PS We get virtually no help from our ins. co. or the gov't. in helping our son. Update.. I just got back from a presentation at my son's school. The speaker was claiming that the majority of these kids outgrow most of the symptoms before adulthood. How is your son progressing?