Kuai Technology reported on August 29 that a study recently released by the Centers for Disease Control and Prevention of the United States showed that after the delta mutant strain of the COVID-19 became the “main force” of the epidemic, the overall effectiveness of the COVID-19 vaccine approved in the United States has been reduced. About one-third. Researchers analyzed the …

Covid-19 病毒传播最远 4 米, 最近鞋底也能蔓延, 美国疾病控制与预防中心发布预警称，新型冠状病毒可在空气中传播至 13 脚 (关于 4 米), 还可能污染鞋底，造成传播. 该信息是 …