Vaccines like to be kept cool, none more so than the Pfizer candidate for Covid-19, which has to be deep-frozen. And that's going to be an issue for developing countries -- and for rural areas in the developed world.
원문출처 : https://www.cnn.com/2020/11/21/world/coronavirus-vaccine-dry-ice-intl/index.html
원문출처 : https://www.cnn.com/2020/11/21/world/coronavirus-vaccine-dry-ice-intl/index.html