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.
美国公共卫生官员建议，新冠疫情等级“较高”地区的已接种疫苗者应该重新在公共室内场所戴上口罩，意味着在传染性较高的Delta变种快速蔓延的形势下，他们改变了两个月前的指导意见。
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