The Pfizer COVID-19 vaccine needs to be stored at minus 70 Celsius. Health care providers will need to store it either in dry ice for shorter stints, or in specialized freezers.

READING, ENGLAND – NOVEMBER 11: A man poses with a fresh supply of coarse dry ice pellets at the Dry Ice Nationwide manufacturing facility on November 11, 2020 in Reading, England. Producing dry ice in a number of forms, the company provides both coarse pellets and slabs for use in temperature-controlled pharmaceutical logistics, pathological environments and chemical laboratories, as well as for food transportation. The covid-19 vaccine developed by Pfizer and BioNTech must be kept at ultra-cold temperatures in its journey from the production line to a patient’s arm. To address this challenge, Pfizer developed a suitcase-sized box that uses dry ice to keep between 1,000 and 5,000 doses for 10 days at minus 70 degrees Celsius. (Photo by Leon Neal/Getty Images)