Right now, we see such major increases in numbers of cases because people have just gone back to living a life that they had long before COVID showed up. So we have a real concern," says Dr. Michael Osterholm, Director of the Center for Infectious Disease Research and Policy at the University of Minnesota
面对高传播力变异病毒,民众防疫措施没有提高反而放松了
加拿大累计感染超200万 魁省再破八千禁令生效