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Why the Moderna and Pfizer Covid-19 vaccines need to be kept in cold storage units

Jean-Christophe Guillaume/Getty Images
The epic global effort to develop a Covid-19 vaccine has been unmatched in its scale, speed, and scientific advances. Now a vaccine for the disease, developed by Pfizer and BioNTech, is on the verge of being rolled out in the US under an emergency use authorization by the Food and Drug Administration, raising hopes of an end to the pandemic.
But the vaccine’s potential to provide immunity to the broader population is now threatened by a massive logistical hurdle in actually getting it to people safely: keeping the vaccine doses cold.
Vaccines are fragile drugs that demand strict temperature controls lest they spoil. And they spoil a lot. According to the World Health Organization, about half of the vaccines distributed around the world go to waste, in large part because of a failure to properly control storage temperatures. That in turn undermines efforts to contain and eradicate disease.

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