Where are the studies comparing autism rates of nonvaccinated children vs. vaccinated? That's right, none have been conducted. But it is common knowledge that autism among groups like the Amish, who don't vaccinate, is almost unheard of. I have heard of a few cases where the mothers had heavy metal poisoning, but that's about it. It's also well known that unvaccinated kids hardly ever get sick. Those ear infections that plague so many babies, just don't happen with kids who aren't vaccinated. Pediatricians have also noted this fact.