Talk of The Villages Florida - View Single Post - New Pfizer Covid-19 Vaccine 90% Effective! Will You Get It?
Thread: New Pfizer Covid-19 Vaccine 90% Effective! Will You Get It?
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Old 11-10-2020, 12:27 PM
chet2020 chet2020 is offline
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Originally Posted by Robbie0723 View Post
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.
There are trials called "challenge trials" where they give people the experimental vaccine, then give them the live virus. These trials are considered unethical by many. However, they are highly efficient and fast. There is a group in England that wants to run challenge trials and the last time I looked, they had 37,000 people that would volunteer for such trials.