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Why Does Pfizer’s COVID-19 Vaccine Need to Be Kept Colder Than Antarctica?

November 20, 2020

From the National Public Radio website

Two drugmakers, Pfizer and Moderna, have announced promising interim results for their vaccine candidates, raising hopes in the U.S. and abroad that the end of the pandemic may be in sight. But, if and when the vaccines are authorized by the Food and Drug Administration, distributing them presents a daunting challenge.

One big reason? One of the front-runners in the vaccine race — the one made by Pfizer — needs to be kept extremely cold: minus 70 degrees Celsius, which is colder than winter in Antarctica. Moderna has said that its vaccine needs to be frozen too, but only at minus 20 Celsius, more like a regular freezer.

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