How many people participated in the clinical trials for the vaccine?

Several different vaccines have been developed for COVID-19. A few of them have made it through clinical trials and have been approved by the U.S. Food and Drug Administration (FDA). Some are still in clinical trials. Of the vaccines approved for use in the U.S., between 30,000 to 45,000 participants enrolled to participate in each study. View information about individual clinical trials, here.

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1. How do we know the COVID-19 vaccine is safe and effective?
2. What are the side effects of the COVID-19 vaccines?
3. How many people participated in the clinical trials for the vaccine?
4. I’ve had an allergic reaction to the flu shot, is it safe to get a COVID-19 vaccine?
5. What are mRNA vaccines and how do they work?
6. Can I get other vaccines at the same time I get a COVID-19 vaccine?
7. When can children get the COVID-19 vaccine?
8. I am pregnant or nursing, can I get the vaccine?
9. Does the vaccine cause reproductive issues?
10. Will the vaccine give me COVID-19 or make me sick?
11. Can I still test positive for COVID-19 after getting the vaccine?
12. Does immunity after getting COVID-19 last longer than protection from COVID-19 vaccines?