New virus variants in U.S. show similarities to more contagious mutati… stocking 0 287 2021.02.15 17:47 https://youtu.be/KEoAE_Avefo + 35 미국서 자생 변이 코로나19 발견…백신 차단막 약화 우려 Researchers in the United States have identified seven new variants of COVID-19... that seem to have ...