I think mine was caused by the combination of the mercury in Mom's teeth and being born by induced labor. If I'd had all the immunizations kids get today, I'm sure I would probably have low functioning autism instead of high functioning autism.
After doing much research, I have come to conclusion that autism is caused by environmental factors, such as toxins, and that one is genetically predisposed to be sensitive ( or not sensitive ) to them. My Dad likely has AS, and my Mom ( who was born by induced labor) has many of the traits.
On the topic of vaccines, there are hundreds of stories of kids who were completely normal before receiving a vaccine, then becoming autistic AFTER getting the vaccine. Since the parents conceived, gave birth, and raised the child, I trust them more than the medical "professionals" who think parents are stupid and who only see the child a few minutes in their office. Oh, and who also have their hands in the drug company's pockets!