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What Does It Mean If a Vaccine Is ‘Successful’?
The pharma companies are all using different playbooks to test their Covid-19 shots,
By Adam Rogers
Even weirder, the trials all use slightly different definitions for those mild symptoms, which means they’re tracking different end points. The vaccines from Pfizer and Moderna, both requiring two doses, will have subtly different criteria for success.
https://www.wired.com/story/what-does-it-mean-if-a-vaccine-is-successful/