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Old 6th July 2020, 08:41 PM   #264
Skeptic Ginger
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Join Date: Feb 2005
Posts: 90,671
Originally Posted by Puppycow View Post
Compare them with a control group.
China has contracted with Canada for their phase 3 trials for this very reason. Since rates of natural exposure in China are way down, there really isn't a good control group. Canada has a high enough rate still that some exposure can be expected in the vaccinated and unvaccinated groups.
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