The race is on to find and produce a vaccine for Covid-19. But when a vaccine is developed, it will face major challenges before becoming available worldwide. CNN's Anna Stewart explains.
원문출처 : https://www.cnn.com/videos/world/2020/05/11/coronavirus-vaccine-race-challenge-stewart-pkg-intl-hnk-vpx.cnn
원문출처 : https://www.cnn.com/videos/world/2020/05/11/coronavirus-vaccine-race-challenge-stewart-pkg-intl-hnk-vpx.cnn