"We've also posted important information to help health care providers understand the benefits, risks and proper use of this FDA authorized vaccine," said Hahn. "The way the regimen was studied was that everyone, ultimately, or almost everyone received two doses of the vaccine, so we only know how people were protected with two doses of the vaccine," Marks said. The FDA is also confident that, although the Pfizer vaccine is delicate, it can be safely distributed. "We've seen cold chains maintained in in locations that are pretty, pretty rural or pretty rough in, for instance, with vaccination campaigns in Africa. Several large hospital groups say they have bought special deep-cold freezers to store Pfizer vaccines.

Source: CNN December 12, 2020 15:45 UTC