Quote:
Originally Posted by New Englander
I've been wondering how they know if a vaccine is effective? Are people who get the vaccine exposed to the live virus?
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They vacinate half a population with the vaccine and the other half without. And then monitor who gets COVID and who does not. At his point, it appears that out of +35,000 participants, close to 100 have gotten COVID, only 9 of those who received the vaccine got COVID.
They do not expose participants to the virus.