As President Joe Biden celebrated America's 300 million vaccine dose milestone Friday, experts warned that the spread of coronavirus variants could spur a surge in troubling new cases if more people don't get inoculated.
원문출처 : https://www.cnn.com/2021/06/19/health/us-coronavirus-saturday/index.html
원문출처 : https://www.cnn.com/2021/06/19/health/us-coronavirus-saturday/index.html