US government advisers have recommended changing the design of Covid-19 vaccines to target the Omicron variant for a booster campaign aimed at blunting an expected surge in infections in the autumn.
美国政府顾问建议改变新冠疫苗的设计,以奥密克戎变体为目标,开展加强针接种,以缓解秋季感染预计激增的趋势。
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