As the highly contagious Omicron coronavirus variant continues to spread across the US this holiday season, the rate of daily Covid-19 cases detected has eclipsed those fueled by the Delta variant over the summer.
원문출처 : https://www.cnn.com/2021/12/25/health/us-coronavirus-saturday/index.html
원문출처 : https://www.cnn.com/2021/12/25/health/us-coronavirus-saturday/index.html