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medRxiv:接种疫苗和未接种疫苗的人,感染德尔塔毒株后,病毒载量相似,传播性也相似

2021-08-05 “ E药世界”公众号 “ E药世界”公众号

2021年7月31日,美国威斯康辛麦迪逊分校的研究人员在医学预印本 medRxiv 发表了一项题为:Vaccinated and unvaccinated individuals have simil

自2020年初新冠大流行以来,突变株不断出现,目前德尔塔突变株已成为全世界范围内最主要的新冠流行株,目前在我国多地出现的新冠疫情同样也是由德尔塔突变株感染所致。

越来越多的研究表明,即使完全接种新冠疫苗,少数人仍然会感染新冠病毒,也就是所谓的突破性感染。但好在目前的突破性感染者基本为轻症或无症状,也就是目前疫苗仍能很好地避免重症的出现。

2021年7月31日,美国威斯康辛麦迪逊分校的研究人员在医学预印本 medRxiv 发表了一项题为:Vaccinated and unvaccinated individuals have similar viral loads in communities with a high prevalence of the SARS-CoV-2 delta variant 的研究论文。

该研究比较了感染新冠德尔塔突变株的未接种疫苗和接种疫苗者的病毒载量,发现无论是否接种疫苗,一旦感染德尔塔突变株,他们体内的病毒载量相似,因此具有相似的传染能力。

现在的研究发现,即使完全接种疫苗,仍有少数人不可避免地被新冠病毒感染,尤其是当前流行的德尔塔突变株,但即使发生了突破性感染,如果疫苗能降低突破性感染者体内的病毒载量,那么也能降低感染者传播给其他人的风险。

因此,研究团队评估了新冠疫苗接种是否能够减少捅破性感染者的病毒载量,他们在美国威斯康星州戴恩县进行了研究,戴恩县人口密度低,疫苗覆盖率很高,达到了68%。研究团队收集了戴恩县83个新冠阳性患者样本。

根据疫苗接种状况和完全接种的日期,研究团队将这83位感染者分为两组:完全接种组32人,未接种组51人。然后使用PCR检测他们的新冠病毒德尔塔突变株的载量。

检测结果表明,在完全接种疫苗和未接种疫苗的个体之间没有观察到德尔塔突变株的病毒载量存在显着差异。

为了进一步分析,研究团队继续分析了来自威斯康星州其他县的另外208个样本。在来自所有县的总共291个样本中,有73个突破型感染病例,84%的突破性感染者的样本的 Ct 值小于30,这表明呼吸道样本中存在传染性病毒。83%的未接种疫苗的感染者中有相近的 Ct 值。令人惊讶的是,大约33%的突破性感染者表现出非常高的病毒载量,Ct 值小于20。

此外,基因测序显示,所有样本的84%为德尔塔突变株感染,这进一步表明在在该研究进行期间威斯康星州的德尔塔突变株具有很高的流行率。

总的来说,这项研究结果表明,即使在完全接种疫苗的个体中,德尔塔突变株仍能突破性感染,并且很大比例的突破性感染者的病毒载量很高,具有将病毒传播给其他人的能力。

在戴恩县,68%的人口都接种了疫苗,但不幸的是,尽管疫苗覆盖率很高,该县发现了高病毒载量的德尔塔突变株的突破性感染比例很高。这一发现进一步强调了频繁检测和持续坚持社交隔离等非药物控制措施的必要性。

原始出处:

Kasen K. Riemersma, Brittany E. Grogan, Amanda Kita-Yarbro, et al. Vaccinated and unvaccinated individuals have similar viral loads in communities with a high prevalence of the SARS-CoV-2 delta variant. medRxiv, 2021. doi: https://doi.org/10.1101/2021.07.31.21261387.

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    2022-03-05 fusion
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    2021-08-05 weigq

    疫苗研发的速度赶不上病毒变异的速度!怎么办?

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