Moderna is launching a trial of a new Covid-19 vaccine as the US biotech group warned that its current shot was less effective in tackling the strain that emerged in South Africa.
莫德納(Moderna)正在啟動一款新的新型冠狀病毒肺炎（COVID-19，即2019冠狀病毒病）疫苗的試驗。這家美國生物技術集團警告稱，其現有疫苗對南非出現的新冠病毒新變種不那么有效。
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