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Full Version: 新毒株传染性虽未必更强 专家吁定期接种冠病疫苗加强免疫力
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传染病专家指出,无迹象显示新冠病毒株更具传染性,但早前染病和接种的第一代疫苗已没多大保护作用,民众应定期接种疫苗。

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