US public health officials have recommended that vaccinated people in areas with “substantial” levels of Covid-19 start wearing masks again in indoor public places, reversing guidance issued two months ago amid the rapid spread of the contagious Delta variant.
美國公共衛生官員建議，新冠疫情等級「較高」地區的已接種疫苗者應該重新在公共室內場所戴上口罩，意味著在傳染性較高的Delta變種快速蔓延的形勢下，他們改變了兩個月前的指導意見。
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