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Originally Posted by yd66 
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# No studies have ever considered unvaccinated children to compare their autism rates to those who receive vaccines.
i have heard the opposite of above line parroted on youtube vaccine video discussions and other places, people insist that there is no difference between children with autism among vaccinated and unvaccinated populations. who is right?
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There are no vaccine safety studies conducted on vaccinated and unvaccinated children. The reason for this is that it would be unethical NOT to vaccinate a child. You cannot randomly assign a child to a vax or non-vax group because not getting the vaccine is withholding vital medical care and unethical. (This is the explanation of why it isn't done.)
Looking at vaccinated populations and unvaccinated populations and trying to see who has higher rates of autism is different from doing a double-blind, controlled study on children who actually are and are not vaccinated. The latter might yield helpful information. The former is rather speculative. There is one study that was done using vaccinated and unvaccinated populations by some green-type group - can't remember the name - and it showed significantly lower rates of autism in the unvaccinated group. However, because it was just a retrospective analysis of data on two populations, and the group is one that has concerns about mass vaccination, the results were written off as unreliable.
ETA: It was Generation Rescue that published that study.