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Why Does Pfizer's COVID-19 Vaccine Need To Be Kept Colder Than Antarctica?

By Selena Simmons-Duffin
Published November 17, 2020 at 5:03 AM EST
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Selena Simmons-Duffin
Selena Simmons-Duffin reports on health policy for NPR.
See stories by Selena Simmons-Duffin