When China first reported cases of coronavirus to the World Health Organization on December 31, 2019, it was described as a mysterious new strain of pneumonia. It didn't even have a name.
원문출처 : https://www.cnn.com/2020/12/28/health/coronavirus-unknown-facts-intl-hnk-dst/index.html
원문출처 : https://www.cnn.com/2020/12/28/health/coronavirus-unknown-facts-intl-hnk-dst/index.html