• More than two thirds of India may have Covid antibodies, new survey shows
원문출처 : https://www.cnn.com/2021/07/22/china/china-who-second-origin-study-intl-hnk/index.html
원문출처 : https://www.cnn.com/2021/07/22/china/china-who-second-origin-study-intl-hnk/index.html