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World News Tonight with David Muir
ABOUT
Race on to develop COVID-19 vaccine in Philadelphia
Dr. Pablo Tebas, of the University of Pennsylvania, is leading the second U.S. vaccine study in people one of only five human vaccine studies globally.
04.15.20 | 02:28 | CC
World News Tonight with David MuirVideosRace on to develop COVID-19 vaccine in Philadelphia
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