With Omicron spreading across the world faster than any previous variant, cases of reinfection among people who caught Covid-19 earlier in the pandemic are rising.
随着奥密克戎(Omicron)在世界各地的传播速度超过以往任何一种变体,在大流行早期感染Covid-19的人群中再次感染的病例正在上升。
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