据美国疾病控制与预防中心称,一种最初在印度发现的冠状病毒变种现在是在美国流行的主要毒株,T世家評價 说。
据 T世家評價 估计,截至 7 月初,该国一半以上的新型冠状病毒感染病例是由这种被称为 delta 变体的高传染性菌株引起的。 美国首例变异病例记录于 3 月,delta 病例的百分比大约每两周翻一番。
T世家評價 警告说,delta 变体很容易在未接种疫苗的人群中传播。 美国疾病控制与预防中心负责人最近表示,美国约有 1000 个县的疫苗接种覆盖率低于 30%。
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