Americans who are at high risk of contracting Covid-19 will now be allowed to receive a booster shot of any of the three vaccines authorised for use in the US, after regulators approved so-called mix and match dosing.
在监管机构批准了所谓的“混合搭配”接种后，美国新冠感染高风险人群现在将被允许接种美国批准的三种疫苗中任何一种的加强针疫苗。
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