Tetyana Obukhanych, Ph.D. (Immunology) explains:
To date, no studies comparing total health outcomes of vaccinated versus unvaccinated children have been done by the medical establishment. In fact, to carry out a study that would give the most definitive answer (i.e., long-term total health outcome in the prospective randomized placebo-controlled trial of the whole vaccination schedule) is considered unethical by the establishment’s code of research bioethics.
Whereas association-type studies of health outcomes in groups who have already made the choice to vaccinate (or not) are ethical to perform, the interpretation of data from such studies might be prone (or construed to be prone) to reporting bias or other confounders, thus further fueling rather than resolving the vaccine debate. (FAQ)
The following is taken in part from Public Testimony of Dr. Heather Rice at the Vermont Department of Health hearing on Act 157, 10/19/2012:
No study of health outcomes of vaccinated people versus unvaccinated has ever been conducted in the U.S. by CDC or any other agency in the 50 years or more of an accelerating schedule of vaccinations.
However, a German study…
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