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July 22, 2021
Uncategorized

CDC:Delta已成全美新冠疫情主流病毒株

根據疾病管制暨預防中心(CDC)所做的資料模型分析,新冠病毒Delta變種病毒株,已經成為目前全美疫情的主流病毒株,超過5成的病例感染該型病毒株。

CDC的資料模型顯示,Delta病毒株在到3日為止的那兩週成為全美疫情的主流病毒株,51.7%的確診病例與Delta病毒株有關係;在此之前全美疫情的主流病毒株Alpha病例比例已經減至28.7%。

這份分析資料是根據CDC全國病毒基因組監測收集到的基因定序資料,每兩週評估在全美最普遍傳播的新型冠狀病毒譜系。之前衛生官員已指出,現在全美每一州都有Delta病毒株的蹤跡。

總統拜登6日鼓勵尚未接種疫苗的民眾去接種,以免受傳染力更高的Delta病毒株感染,他說,「數百萬名美國人尚未接種,沒有受到保護,因此,他們的社區有風險、他們的朋友有風險」,「因為Delta變種病毒株,情況更令人擔心」。

根據統計,到7日為止全美55%人口接種了至少1劑,47%接種完整2劑;18歲以上成年人兩者的比率為67%和58%。

目前全美平均每日新增約1萬3000例確診病例,較兩週前的平均每日新增1萬1000例略增。衛生官員擔心,低接種率地區將成為疫情熱點,可能引發一波住院潮,並且讓病毒進一步變種。

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