4 phases of COVID-19 vaccine clinical trials explained | USA TODAY
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COVID-19: What are the 4 phases of vaccine clinical trials? RELATED: Dr. Anthony Fauci's latest testimony https://youtu.be/X7ks62Jtvn0 Approving a vaccine in the U.S. usually takes years, but COVID-19 vaccines are moving through in record time. What does that mean? » Subscribe to USA TODAY: http://bit.ly/1xa3XAh » Watch more on this and other topics from USA TODAY: http://bit.ly/2SGVh9f » USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR. #covid19
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