There is an important study being done that compares the rates of autism in vaccinated versus unvaccinated populations.  It's an important study because it follows the vaccination schedules most of today's children have to face.  

The first phase of this monkey study was published three months ago in the prestigious medical journal Neurotoxicology, and focused on the first two weeks of life when the vaccinated monkeys received a single vaccine for Hepatitis B. The results, which you can read for yourself HERE, were disturbing. Vaccinated monkeys, unlike their unvaccinated peers, suffered the loss of many reflexes that are critical for survival.

Please be sure to check out the rest of this article on the Age of Autism site.  http://www.ageofautism.com/2010/02/a-statement-from-jenny-mccarthy-jim-carrey-andrew-wakefield-scientific-censorship-and-fourteen-monke.html  If this link doesn't work, please select it, copy and paste it into your browser window.  it's worth reading.