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.
美國制藥集團默克(Merck)開發的一種治療新冠肺炎的重磅藥物與冠狀病毒在患者之間傳播時產生的突變有關，這一發現將加強對其有效性以及政府在采購該藥上花費的數十億美元的審查。
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