A new genetic analysis of the virus that causes Covid-19 taken from more than 7,600 patients around the world shows it has been circulating in people since late last year, and must have spread extremely quickly after the first infection.
원문출처 : https://www.cnn.com/2020/05/05/health/genetics-coronavirus-spread-study/index.html
원문출처 : https://www.cnn.com/2020/05/05/health/genetics-coronavirus-spread-study/index.html