Health officials in the United States have said Covid-19 vaccine boosters can begin for older and higher-risk people there. But at least 15 countries around the world -- most of them in Africa -- have yet to give at least one vaccine dose to more than 3% of their population.
원문출처 : https://www.cnn.com/2021/09/24/world/covid-vaccine-shortages-us-booster-doses-intl/index.html
원문출처 : https://www.cnn.com/2021/09/24/world/covid-vaccine-shortages-us-booster-doses-intl/index.html