In the race to protect their populations against the Omicron coronavirus variant, countries including the UK and the US are rolling out extensive booster programmes after data showed additional jabs provided more protection against the new strain than two shots.
在保护本国人口免受新冠病毒Omicron变种影响的竞赛中，包括英国和美国在内的国家正在推出广泛的加强针计划，此前有数据显示，接种第三针疫苗比接种两针更能预防新变种Omicron感染。
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