CDC Director: 'Very Aggressive' Contact Tracing Needed For U.S. To Return To Normal

By Rob Stein,
Selena Simmons-Duffin
Published April 10, 2020 at 4:00 AM CDT
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Rob Stein
Rob Stein is a correspondent and senior editor on NPR's science desk.
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Selena Simmons-Duffin
Selena Simmons-Duffin reports on health policy for NPR.
See stories by Selena Simmons-Duffin