R.R.
There is an AWESOME article on what predisposes and leads to autism in the Winter 2007 Wise Traditions quarterly publication of the Weston A Price foundation. It also offers a protocol to help turn around the condition (the author's child was diagnosed around age 3 and is now a completely normal teenager... early treatment has positive results for 60-70% of those who tried it, she says).
Pretty much, the vaccines do not CAUSE autism... it is more that it may be the straw that breaks the camel's back. So it's a great read to understand how to counterract the problems that would predispose a child to autism and the immune response to a vaccine.