大魔王“XBB.1.5”狂袭美国 比例高达40%
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新型冠状病毒病(COVID-19)突变病毒株仍不断演化,据称是目前“免疫力逃脱能力”(Antibody
evasion)最强的Omicron亚型毒株XBB.1.1.5,来势汹汹,迅速成为美国头号流行毒株。
美国疾病管制暨预防中心(CDC)12月30日通报,截至12月31日当周,XBB.1.5已经占全美确诊总数的44.1%,比12月24日当周的21.7%翻了一倍之多,恐怕将在这个冬天再掀起一波感染潮。
XBB是Omicron亚型变异株BA.2的分支,8月在印度首次被发现,之后迅速传播,很快成为新加坡、马来西亚等国主要流行株。此后,XBB突变株逐渐演变成2个亚分支,包括XBB.1和XBB.1.5。
研究指出,XBB致病力并未明显增强,但由于毒株突变能更易与人体细胞受体结合,XBB.1.5免疫逃逸能力更高。
最新研究显示,XBB.1.5的致病力并未明显增强,与BA.2.75类似或更低。然而,其关键突变F486P能更易与人体细胞结合,更容易感染人。除追加剂的效力也有所降低此外,雷杰纳荣(Regeneron)和礼来(Eli
Lilly)两家药厂现有的单株抗体已对XBB无效,但针对保守靶点的小分子药物仍保持疗效。
XBB患者最常报告的症状,与其他Omicron变种相似,包括:咳嗽、发冷、发烧、喉咙痛、腹泻、身体疼痛、极度疲劳、嗅觉和味觉丧失等。
美国传染病学专家佛奇(Anthony
Fauci)11月间指出,以最初变异株和亚型变异株BA.4、BA.5为预防目标的更新版疫苗追加剂,对XBB仍具“一些防护力,但没有最佳防护效果”。
Omicron亚变种XBB已跃居美国主流毒株。示意图。(法新社)
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