Vaccines in Phase 3 Clinical Trials

As of February 27, 2021, large-scale (Phase 3) clinical trials are in progress or being planned for two COVID-19 vaccines in the United States:

• AstraZeneca COVID-19 vaccine
• Novavax COVID-19 vaccine​

Learn more about U.S. COVID-19 vaccine clinical trials, including vaccines in earlier stages of development, by visiting clinicaltrials.govexternal icon.
This page will be updated as additional information is available.

​https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines.html