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» BA.4、BA.5惊现危险警讯 专家叹:显然不是感冒
BA.4、BA.5惊现危险警讯 专家叹:显然不是感冒
文章来源: 中时新闻网 于
2022-06-15 01:17:20
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日本研究发现,BA.4、BA.5、甚至是BA.2.12.1等亚变种已经进化为更易于感染肺部细胞而非上呼吸道细胞,让英国专家感叹病毒正变回更危险的形式,显然不是普通感冒。
英国BA.4、BA.5确诊病例正在增加,让专家警告当地将在冬天迎来疫情大爆发,英国《卫报》(The
Guardian)报导,日本东京大学团队5月底在医学期刊预印本网站bioRxiv刊登Omicron亚变种的实验成果。
研究发现,Omicron亚变种BA.4、BA.5、甚至是目前在美国盛行的BA.2.12.1,可能已经进化为更易于感染肺部细胞、而非上呼吸道组织的病毒,让这些亚变种与BA.1、BA.2等Omicron早期亚变种不同,而是更类似于Alpha或Delta等早期变异株,早期Omicron亚变种较倾向感染肺部以外的组织,可能是多数患者症状较轻的主因。
整体而言,东京大学的研究发现,BA.4、BA.5、BA.2.12.1在人类肺脏细胞的复制能力较BA.2更有效率;在仓鼠的研究中也发现,感染BA.4、BA.5的症状可能更严重;这些亚变种的再生数(reproduction
number)似乎也高于BA.2;BA.4、BA.5似乎能抵抗患者先前感染Omicron时诱发的抗体。
率领研究的东京大学教授佐藤佳总结,他们的研究显示,”Omicron亚变种,特别是BA.4、BA.5,对全球健康的风险可能大于BA.2。”
这项研究让英国里兹大学(Leeds University)病毒专家葛里芬(Stephen
Griffin)发出警讯:”看起来这些东西正转向更危险的感染形式,往下到肺部。”这项研究也终结了病毒即将变成普通感冒的说法,”显然不是”,葛里芬说。
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