A blockbuster drug developed by US pharmaceutical group Merck to treat Covid-19 has been linked to mutations transmitted when the coronavirus spreads between patients, a finding that will increase scrutiny about its usefulness and the billions spent by governments on its procurement.
美国制药集团默克(Merck)开发的一种治疗新冠肺炎的重磅药物与冠状病毒在患者之间传播时产生的突变有关，这一发现将加强对其有效性以及政府在采购该药上花费的数十亿美元的审查。
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