The SARS-CoV-2 virus, which causes Covid-19, has sickened millions of people around the world and upended everyday life in unprecedented ways. A vaccine has the potential to return society to something that resembles normal. Scientists are racing to develop one, but they must first ensure that it is both effective and safe.

Watch this video to learn more about how vaccine trials are performed, and the major challenges researchers face getting a vaccine to market.

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