What are mRNA vaccines and how do they work?

The first 2 COVID-19 vaccines approved for use in the U.S. were messenger ribonucleic acid (mRNA) vaccines. Learn more about mRNA COVID-19 vaccines, 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?