The World Health Organization is expected to say an Omicron-targeted Covid-19 vaccine dose can be administered as a third shot in order to broaden immune responses in the face of a virus that is “likely” to continue to evolve.
世界卫生组织(WHO)预计将表示,针对奥密克戎变种的新冠疫苗可以作为第三针注射,以扩大面对这种“可能”继续进化的病毒的免疫反应。
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