Israel is to start offering a fourth dose of the coronavirus vaccine to some of its citizens, a world first, as concerns over the efficacy of existing shots against Omicron continue to mount globally.
以色列將開始向部分公民提供第四劑冠狀病毒疫苗,在世界上是頭一個。目前,全球對現有疫苗預防Omicron感染的效力日益擔憂。
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