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Race To Immunize Tightens As Cases Rise; Promising Vaccine News Released

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Race To Immunize Tightens As Cases Rise; Promising Vaccine News Released

Empty Pfizer COVID-19 vaccine vials are collected in a tray to be destroyed to prevent them from being resold or refilled, at a vaccination center in the Victor Jara Stadium in Santiago, Chile, Tuesday, March 30, 2021. (AP Photo/Esteban Felix)

Esteban Felix/AP

Scientists are growing concerned the U.S. may be headed for a fourth wave. COVID-19 cases are rising rapidly, mirroring an increase in many countries around the world.

Harvard epidemiologist Bill Hanage tells NPR he's worried another surge in the U.S. will fuel the spread of the variant known as B.1.1.7 .

In the meantime, there's new evidence that vaccines from Pfizer and Moderna are effective at preventing viral spread — and that they produce "robust" antibody response in children ages 12-15. NPR's Joe Palca has more.

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Email us at considerthis@npr.org.

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