A World Health Organization (WHO) report into the origins of the coronavirus pandemic said the virus probably spread to people through an animal, and was transmitted among humans no more than a month or two before it was noticed in December 2019.
원문출처 : https://www.cnn.com/2021/03/31/world/coronavirus-newsletter-intl-03-31-21/index.html
원문출처 : https://www.cnn.com/2021/03/31/world/coronavirus-newsletter-intl-03-31-21/index.html