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 11-09-2020, 04:53 PM
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I've been wondering how they know if a vaccine is effective? Are people who get the vaccine exposed to the live virus?