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Joanna wrote:
"I too would like a study that looks at totally vaccinated and totally unvaccinated but they haven't done this. I would certainly volunteer my children if such a study were in place. Parents have been asking the CDC for years, and other organisations."

It has been explained, again and again and again, why a prospective double blind study on vaccinated vs. unvaccinated children would be impossible to do and deeply unethical.

The most thorough and in-depth discussion of a prospective study on "vaccinated vs. unvaccinated" was written by an independent health care professional at the blog Harpocrates Speaks. It was published earlier this year (2011), and It's in four parts :

Part 1 is an overview of study design (prospective vs. retrospective
http://silencedbyageofautism.blogspot.com/2011/03/vaccinated-vs-unvaccinated-rct-overview.html

Part 2 is a history of medical research ethics:
http://silencedbyageofautism.blogspot.com/2011/03/vaccinated-vs-unvaccinated-history-of.html

Part 3 is an ethical evaluation of any such prospective study
http://silencedbyageofautism.blogspot.com/2011/03/vaccinated-vs-unvaccinated-part-3.html

Part 4 is the legal perspective on doing such a study
http://silencedbyageofautism.blogspot.com/2011/03/vaccinated-vs-unvaccinated-part-4-legal.html

Given that Joanne has previously said something to the effect that she studies such things in depth, I am sure she will read these four posts and report on her new understanding of the real limitations of doing such a prospective study.