What Happened Today: Drug Maker Reports Early Success In Vaccine Trial NPR's Ari Shapiro speaks with Dr. Celine Gounder, an epidemiologist and infectious disease specialist, about what the data tells about the state of the coronavirus pandemic in the U.S.

What Happened Today: Drug Maker Reports Early Success In Vaccine Trial

What Happened Today: Drug Maker Reports Early Success In Vaccine Trial

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NPR's Ari Shapiro speaks with Dr. Celine Gounder, an epidemiologist and infectious disease specialist, about what the data tells about the state of the coronavirus pandemic in the U.S.