China still faces the "big challenge" of a potential second wave of Covid-19 infections, the country's top respiratory authority has warned, with the lack of immunity among the community a serious concern as the race to develop a vaccine continues.
원문출처 : https://www.cnn.com/2020/05/16/asia/zhong-nanshan-coronavirus-intl-hnk/index.html
원문출처 : https://www.cnn.com/2020/05/16/asia/zhong-nanshan-coronavirus-intl-hnk/index.html