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Why is deep-freezing needed for the COVID-19 vaccine?

The vaccine 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. Both the...

Moderna’s Vaccine Candidate Against COVID-19

Does this mean the end of the pandemic? On Monday, the Massachusetts-based company Moderna reported promising preliminary results from its coronavirus vaccine trial. It offered more hope that there’s going to be a way out of the pandemic. Vaccines prepare...
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