国际医学期刊《新英格兰医学杂志》于周三刊出美国哈佛大学的最新研究,指出新冠变种毒株Omicron亚型BA.4及BA.5在新冠康复者及已完成接种新冠疫苗兼注射加强针的人士身上,都更易逃避抗体。
研究发现,与Omicron亚型BA.1和BA.2相比,康复者与已打疫苗加强剂人士对BA.4及BA.5的中和抗体效力低3倍,料BA.4和BA.5会导致有高疫苗覆盖率及高群体免疫的人口发生大规模感染,但接种疫苗仍能有效避免BA.4和BA.5患者出现重症。
BA.4及BA.5是至今传播速度最快的新冠变种毒株,美国上周的新症有35%是感染这两款毒株,较前一周的29%上升,估计未来数周会变成美国、英国及欧洲的主流毒株。
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