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Nat Med:接种BNT162b2疫苗加强免疫后对Delta变异株突破性感染病毒载量的影响

2021-11-03 MedSci原创 MedSci原创

即使以SARS-CoV-2病毒Delta变异株为主的大流行,BNT162b2也可能降低BTI的传染性,尽管这种保护性作用会随着时间的推移而下降,但它可以通过第三剂加强疫苗接种至少暂时恢复保护性效应。

BNT162b2疫苗(辉瑞/BioNTech)在预防COVID-19方面具有很高的疗效,并在预防感染、症状、住院、严重疾病和死亡方面具有实际的效果。此外,研究人员也已经报道了该疫苗可降低突破性感染(BTI)的病毒载量,这表明它也可以降低严重急性呼吸系统综合症冠状病毒2(SARS-CoV-2)的传染性。但是,随着接种时间推移,2019冠状病毒病(COVID-19)BNT162b2疫苗在预防疾病和减少BTI的病毒载量方面的有效性一直在下降,同时SARS-CoV-2病毒的Delta变异株增加。然而,目前尚不清楚观察到的疫苗在减少病毒载量方面的有效性降低是Delta变异所固有的还是取决于免疫时间。

近日,顶级医学期刊Nature Medicine上发表了一篇研究文章,研究人员通过分析以色列当前以SARS-CoV-2病毒Delta变异株为主的大流行期间超过16000例感染病例的病毒载量。

研究人员发现最近完全接种疫苗的个体中的BTI病毒载量低于未接种疫苗的感染个体。然而,这种效果在接种疫苗2个月后开始下降,并且这种保护效应最终在接种疫苗6个月或更长时间后消失。值得注意的是,研究人员发现BNT162b2疫苗降低了BTI病毒载量的效果在加强接种剂量后得以恢复。

由此可见,这些结果表明,即使以SARS-CoV-2病毒Delta变异株为主的大流行,BNT162b2也可能降低BTI的传染性,尽管这种保护性作用会随着时间的推移而下降,但它可以通过第三剂加强疫苗接种至少暂时恢复保护性效应。

原始出处:

Matan Levine-Tiefenbrun,et al.Viral loads of Delta-variant SARS-CoV-2 breakthrough infections after vaccination and booster with BNT162b2.Nature Medicine.2021.https://www.nature.com/articles/s41591-021-01575-4

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    2021-12-05 liye789132251
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    2021-11-04 xugc
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