Phase 3 of coronavirus vaccine trials begin

Nearly 100 medical sites are beginning phase 3 trials of coronavirus vaccines, which require participants to test particular possible vaccines. See how it works from the Meridian Clinical Research center in Rockville, Maryland. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/

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