What happens in a vaccine clinical trial?

Trials generate scientific data used by the U.S. Food and Drug Administration (FDA) to ensure that vaccines meet safety and effectiveness standards. Clinical trials for all COVID-19 vaccines are being conducted according to the same rigorous standards.

If FDA finds that a vaccine meets those standards, it can make the vaccine available for use in the United States by approval or emergency use authorization. Learn more: https://bit.ly/3pE2Go7 .