Nature:灭活疫苗加强针可防奥密克戎致重症

2022-01-30 网络 网络

新研究显示,接种三剂新冠灭活疫苗有望对奥密克戎变异株提供有效的重症保护。

新研究显示,接种三剂新冠灭活疫苗有望对奥密克戎变异株提供有效的重症保护。

1月28日,《自然》杂志发表了由中国科学院生物物理研究所王祥喜研究员领衔的一篇研究文章,研究结果显示,新冠灭活疫苗加强针可通过提升B细胞免疫记忆实现对奥密克戎突变株感染重症的保护。

论文截图

此次研究王祥喜团队对科兴灭活疫苗接种志愿者血清中的存量中和抗体滴度和记忆B淋巴细胞抗体谱系进行了系统分析。

上述研究指出,对60名接种过两剂次(0、1月程序)和60名接种过三剂次(0、1、7月程序)新冠灭活疫苗志愿者的血清进行采集,通过新冠活病毒中和实验评估其对原始毒株和Omicron变异株的中和效价。接种两剂和三剂新冠灭活疫苗志愿者针对Omicron中和抗体的血清转换率分别为3.3% (2/60) 和95% (57/60),表明灭活疫苗加强针接种有助于提升血清中的存量中和抗体。接种三剂新冠灭活疫苗后,志愿者血样中针对Omicron突变株的中和抗体的平均滴度为15.4,比针对原始毒株的中和抗体降低了16.5倍,但这一水平仍然比接种两剂灭活疫苗产生针对Delta突变株的中和抗体水平要高。

前期在巴西、智利等国的真实世界数据表明接种两剂灭活疫苗对Delta突变株的重症保护效率超过80%。但是,在智利、巴西等国家真实世界数据表明,前期两剂次灭活疫苗产生针对德尔塔中和抗体几何平均滴度为6~10。因此,推测三剂次灭活疫苗对奥密克戎感染临床中重症的保护可能仍然有效。现有疫苗接种后,血清存量中和抗体的水平不足以充分遏制突破性感染,那为什么还能有效提供重症保护呢?

研究中分离出的31株广谱强效抗体中,有13株抗体对奥密克戎的IC50小于0.02ug/ml,是葛兰素史克与Vir生物技术公司(GSK/Vir)的VIR-7831和国内丹序生物尚处于临床试验阶段的DXP-604中和活性的10-40倍。

图片

研究者通过研究数据找到了答案。该研究从多名三剂新冠疫苗接种者的新冠特异性记忆B淋巴细胞中成功获得323株全人源抗体,其中24株对奥密克戎等突变株均有出色抑制活性,IC50(半数抑制浓度)均小于0.1微克/毫升(μg/mL)。这表明三剂次疫苗免疫后,约7%的记忆B淋巴细胞携有广谱性中和抗体,当人体被奥密克戎突变株感染时,这部分记忆B细胞会被特异性激活并增殖,产生大量能分泌高效中和抗体的浆细胞,从而实现对奥密克戎突变株的重症保护。

研究者认为,灭活疫苗加强针接种将有助于提升对奥密克戎突变株感染的重症保护。目前,相关数据也已提前上报国家药监局和世界卫生组织,为中国及全球新冠疫情防控公共策略的制定提供科学依据。

原始出处:

Wang K, Jia Z, Bao L, Wang L, Cao L, Chi H, Hu Y, Li Q, Jiang Y, Zhu Q, Deng Y, Liu P, Wang N, Wang L, Liu M, Li Y, Zhu B, Fan K, Fu W, Yang P, Pei X, Cui Z, Qin L, Ge P, Wu J, Liu S, Chen Y, Huang W, Qin CF, Wang Y, Qin C, Wang X.Memory B cell repertoire from triple vaccinees against diverse SARS-CoV-2 variants.Nature. 2022 Jan 28. doi: 10.1038/s41586-022-04466-x.

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    2022-01-30 查查佳佳

    杂志Stroke上发表了一篇研究文章,

    0

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    2022-01-30 ms1000001992064009

    学习

    0

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    2022-01-30 小小医者

    若有临床验证更好

    0

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安徽新冠疫苗应急采购结果出炉,三款国产灭活疫苗均纳入使用

安徽省医药集中采购服务中心近日公布的文件显示三款国产灭活疫苗均纳入使用。

高福谈新冠疫苗研发:灭活疫苗中国走得很快 反馈的效果也很好

近日,多款新冠疫苗陆续获批并开始在多国大规模接种。中国攻坚克难,以严谨规范态度进行疫苗研发……目前全球疫苗有哪些不同类型?中国的疫苗研发经历了怎样的过程?科学家对新冠肺炎病

西安单市确诊破千,白菜价飙升500%;灭活疫苗对奥密克戎保护力数据公布!

连续四天,西安每日新增本土确诊破百,甚至超150例。12月9日至今,西安累计本土确诊病例超过1000例,这是继湖北疫情之后,首次单市确诊病例破千。