The BioNTech/Pfizer vaccine is less effective in halting the spread of the Delta variant than that of previous strains of coronavirus, according to a preliminary study by Israel’s health ministry.
以色列卫生部的一项初步研究显示,BioNTech/辉瑞(Pfizer)新冠疫苗阻止Delta变种传播的效果,不如阻止此前新冠病毒毒株传播的效果好。
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