Wednesday, February 24, 2021

What Is A Cold Chain? And Why Do So Many Vaccines Need It?

An employee makes dry ice pellets at Capitol Carbonic, a dry ice factory in Baltimore in Nov. 2020. Dry ice helps keep COVID-19 vaccines cool during transport.

Many of the coronavirus vaccines like it cold. Really cold. Sub-zero cold. Why is this the case? And how is the world handling this frigid requirement?

(Image credit: Saul Loeb/AFP via Getty Images)

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