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.
莫德纳(Moderna)正在启动一款新的新型冠状病毒肺炎(COVID-19,即2019冠状病毒病)疫苗的试验。这家美国生物技术集团警告称,其现有疫苗对南非出现的新冠病毒新变种不那么有效。
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