N Engl J Med:第三针BNT162b2疫苗接种对Omicron中和效果如何

2022-01-01 MedSci原创 MedSci原创

2021年11月26日,世界卫生组织(WHO)将首次在南非发现的严重急性呼吸综合征冠状病毒2型(SARS-CoV-2)变异株命名为B.1.1.529(omicron)。目前,其他许多国家已经发现了om

2021年11月26日,世界卫生组织(WHO)将首次在南非发现的严重急性呼吸综合征冠状病毒2型(SARS-CoV-2)变异株命名为B.1.1.529(omicron)。目前,其他许多国家已经发现了omicron变异体的病例。

BNT162b2疫苗(Pfizer–BioNTech)之前已被证明对COVID-19具有95%的有效性,但是否会有效中和omicron变体的感染尚不清楚。我们比较了接种两剂疫苗的参与者血清样本中omicron感染细胞的中和作用与接种三剂疫苗的参与者样本中的中和作用。

实验方法:

使用从两组20名医护人员中获得的血清样本,用野生型病毒和B.1.351(beta)、B.1.617.2(delta)和omicron变异分离株进行微中和试验。一组包括接种2剂BNT162b2疫苗的参与者(平均值,自接种第2剂后165.6天),第二组包括接种3剂疫苗的参与者(平均值,自接种第3剂后25天)。使用Wilcoxon配对符号秩检验评估显著性。

实验结果:

接受3剂疫苗比接受2剂疫苗能更好地中和野生型病毒和3种变异株(图1)。1).第2次接种后,野生型病毒及β、δ和omicron变异株的几何平均滴度分别为16.56、1.27、8.00和1.11,第3次接种后分别为891.4、152.2、430.5和107.6。在接受过2次接种的参与者获得的样本中观察到BNT162b2疫苗对所有被测关注变体(β、δ和omicron)的中和效率显著低于对野生型病毒的中和效率,而在接受过3次接种的参与者获得的样本中观察到BNT162b2疫苗对所有被测关注变体(β、δ和野生型病毒)的中和效率也显著低于野生型病毒(图1B和1D)。对β和omicron变异体的中和效率低于对野生型病毒的中和效率,在接受两次给药的参与者和接受三次给药的参与者获得的样本中相似。第三剂BNT162b2疫苗有效中和了omicron变异体的传染(几何平均滴度,第二剂后1.11  vs. 第三剂后107.6)(1A和1 C)。

图1:对野生型病毒和Beta、Delta和Omicron变种病毒的中和效率

结论:

我们分析了BNT162b2疫苗对野生型SARS-CoV-2和β、δ和omicron变体的中和效率。该研究的局限性包括检测的队列较小,以及该检测仅为体外检测的事实。然而,我们发现在接受第二剂后超过5个月进行评估,两剂BNT162b2疫苗对野生型病毒和δ变体的中和效率较低,,对omicron变体没有中和效率。第三次接种疫苗的重要性是显而易见的,因为第三次接种后对omicron变异株的中和效率高于第二次接种后(100倍);然而,即使接种了三次疫苗,对omicron变体的中和作用低于对δ变体的中和作用(4倍)。但目前第3剂疫苗抗Covid-19效果的持久性尚待确定。

 

 

原文链接:https://pubmed.ncbi.nlm.nih.gov/34965337/

Third BNT162b2 Vaccination Neutralization of SARS-CoV-2 Omicron Infection

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    2022-07-28 spoonycyy
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    2022-12-05 xjy02
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    2022-07-03 haouestc
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