In the US, the Delta variant was first detected by mid-March 2021, and rapidly led to a new wave of infections. A nationwide study in the US reported a drop in Alpha variant cases from 70% in late April to 42% in mid-June, with the B.1.617.2 variant driving the shift [12]. In the early summer of 2021, Delta became the predominant variant in North America, as well as in South Africa, India, the UK and Canada [11,12,13,14,15]
牛大春 写了： ↑31 10月 2025, 17:04In the US, the Delta variant was first detected by mid-March 2021, and rapidly led to a new wave of infections. A nationwide study in the US reported a drop in Alpha variant cases from 70% in late April to 42% in mid-June, with the B.1.617.2 variant driving the shift [12]. In the early summer of 2021, Delta became the predominant variant in North America, as well as in South Africa, India, the UK and Canada [11,12,13,14,15]
行啦，你的记性有误，如果delta先在美国扩散开，那么当时就反应疫苗没用了，几年前的事情都记不清楚
resso 写了： ↑31 10月 2025, 17:09牛大春 写了： ↑31 10月 2025, 17:04In the US, the Delta variant was first detected by mid-March 2021, and rapidly led to a new wave of infections. A nationwide study in the US reported a drop in Alpha variant cases from 70% in late April to 42% in mid-June, with the B.1.617.2 variant driving the shift [12]. In the early summer of 2021, Delta became the predominant variant in North America, as well as in South Africa, India, the UK and Canada [11,12,13,14,15]
行啦，你的记性有误，如果delta先在美国扩散开，那么当时就反应疫苗没用了，几年前的事情都记不清楚
美国大众普遍打疫苗是2021夏季的事情。那时候德尔塔早就扩散开了。几年前的事情都记不清楚？
疫情刚开始的时候，飞机一飞机一飞机的人转飞韩国等其他国家然后飞到美国，都是千里来投毒的
美国两党虽然乱哄哄，但是抗疫跟其他国家比，好太多了，我朋友没有入籍的，疫情在上海逃难回美国，马上申请入籍。那时候逃离国内的人不要太多。
