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Novel COVID-19 Vaccines Are Like Melting Chocolate

  • November 30, 2020

Pfizer’s COVID-19 vaccine has to be stored at an unheard of cold temperature even for Antarctica — minus 70 degrees Celsius, or 94 degrees below zero, Fahrenheit. Moderna’s can be kept a bit warmer, at “just” minus 20 degrees Celsius, or 4 below zero, Fahrenheit. But, for either vaccine, and particularly Moderna’s, this poses a problem for providers who will be administering the shots. To get an idea of why the vaccines have to be frozen, NPR compares them...