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July 27, 2021
美國要聞

CDC收緊防疫 高傳播區打了疫苗室內需戴口罩

新冠變種Delta病毒在全美各地傳播,聯邦疾病防治中心(CDC) 27 日宣布更新防疫指南,建議在疫情激增的地區,即便打完疫苗的人,也繼續在室內戴口罩,並建議教師、學生及學校的訪客,無論打沒打疫苗,均要在室內戴口罩,以防範傳染力極高的Delta病毒。

CDC根據Delta變種病毒在已接種人群中傳播的能力發布這項新指南,建議在新冠疫情高傳染地區生活的已接種者,以及與幼童或免疫力較低的易感染家庭成員同住的已接種者,在室內公共場所戴回口罩,同時呼籲在學校的老師、教職和學生,無論打沒打疫苗,均戴回口罩。

近期Delta變種病毒在各地廣泛傳播,低接種率地區尤其嚴重,全美平均日增確診逾5萬7000例、住院2萬4000人。

CDC主任羅謝爾‧瓦倫斯基(Rochelle Walensky)表示,絕大多數新增感染是未接種人群,但已接種人群也會出現通常導致輕癥的「突破感染」(breakthrough infections)。

相比之前的毒株,已接種者感染後的病毒載量較低,不太可能再大面積傳播給他人,但變種Delta在已接種者感染後的病毒載量與未接種者感染後差別不大。

瓦倫斯基表示,這些數據來自過去幾天確診的100個感染樣本,情況令人擔憂,「讓我們感到不得不採取行動,已接種者感染Delta之後也可能傳播病毒給他人。」

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