The warning from the head of Moderna, the pharmaceuticals group, that Covid-19 vaccines were likely to be less effective against the Omicron variant has provoked anxiety over the best weapon the world has to fight the pandemic.
制药集团Moderna负责人警告称，Covid-19疫苗对奥密克戎(Omicron)变异病毒的效力可能会降低。这一警告引发了人们对世界抗击疫情的最佳武器的担忧。
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