I don't know anyone who has it, but I'm of the belief that it's caused by the mercury in vaccines. Doctors give tiny babies multiple mercury-laden shots at one time; in my opinion it's nearly criminal. Autism didn't exist until babies started getting vaccinated, it doesn't exist in the Amish (they don't vaccinate babies), and it doesn't exist in third-world countries too poor to vaccinate.
And it won't exist in my kids, as they won't be vaccinated. Especially since the numbers show that, for the Hep. B vaccination, a child is 127x more likely to die from the vaccination than the disease. (Reference:
http://www.mercola.com/2000/nov/5/victory_over_sids.htm ; about 2/3 down the page.)
(Sorry about the slightly off-topic rant--this is a sore spot with me.)
http://www.mercola.com/2001/mar/7/autism_vaccines.htm