Pfizer and BioNTech are preparing to start clinical trials of a version of their Covid-19 vaccine targeting the Delta variant next month, amid fears that existing jabs will offer less protection against the infectious strain spreading quickly across much of the world.
輝瑞(Pfizer)和BioNTech準備下月對專門針對Delta變種的新冠疫苗開展臨牀試驗。人們正在擔心，現有疫苗對這種在全球各地迅速傳播的強傳染性毒株的保護力下降。
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