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How were the COVID vaccines tested?

Health care workers answer questions about the COVID-19 vaccines.

Noha Aboelata, MD explains how the COVID vaccines were tested, and the vaccine development process.


The process was a randomized double-blinded control trial. So half of the people got the vaccine, half of the people did not get the vaccine and then they checked on how people would, how did they feel, what were their symptoms or their side effects? And then most importantly, did they get COVID-19? And then how sick did you get? And I think that was one of the most remarkable things about the vaccine is that none of them died from COVID-19 and none of them got severely ill from COVID-19.

This information is shared for educational purposes only and should not be used as a substitute for professional medical advice. The views expressed are those of the featured medical professional and reflect information available to that professional at time of filming. Always consult a health care provider for any personal health decisions. Click here for vaccine FAQs from the CDC.

Stay up to date with your COVID vaccine, including boosters!

COVID vaccines are safe and effective for everyone ages 6 months and older.

Immunity wanes over time. Keep up your protection against COVID by getting boosted when eligible.

Updated boosters are available for adults and children 6 months and older.