Wealthy countries are finalising plans to roll out coronavirus booster programmes to counter the threat from waning vaccine immunity, decisions that will further squeeze the supplies available to the developing world.
富裕國家正在敲定推出冠狀病毒加強疫苗的計劃,以應對疫苗免疫力下降帶來的威脅,這些決定將進一步擠壓發展中國家的可用供應。
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