The Pfizer-BioNTech COVID-19 vaccine was the first to be approved by the U.S. Food and Drug Administration, with first doses shipped out around the country this month. Another vaccine, this one made by Moderna, has received emergency authorization as well, and the first shipments arrived this week. The next major hurdle is transporting the vaccine safely. This is how it works:Vaccines need to stay in a certain temperature range, usually refrigerated, to remain effective. More than half of vaccines may be wasted globally every year because of temperature control, logistics and shipment-related issues, according to the World Health …
