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利用数字液滴 PCR 技术检测 SARS-CoV-2 病毒载量与患者症状及临床结局的相关性。

Association between SARS-CoV-2 Viral Load and Patient Symptoms and Clinical Outcomes Using Droplet Digital PCR.

机构信息

Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, CA 92039, USA.

Veterans Medical Research Foundation, San Diego, CA 92161, USA.

出版信息

Viruses. 2023 Feb 5;15(2):446. doi: 10.3390/v15020446.

Abstract

The association between nasopharyngeal (NP) SARS-CoV-2 viral loads and clinical outcomes remains debated. Here, we examined the factors that might predict the NP viral load and the role of the viral load as a predictor of clinical outcomes. A convenience sample of 955 positive remnant NP swab eluent samples collected during routine care between 18 November 2020 and 26 September 2021 was cataloged and a chart review was performed. For non-duplicate samples with available demographic and clinical data (i.e., non-employees), an aliquot of eluent was sent for a droplet digital PCR quantification of the SARS-CoV-2 viral load. Univariate and multivariate analyses were performed to identify the clinical predictors of NP viral loads and the predictors of COVID-19-related clinical outcomes. Samples and data from 698 individuals were included in the final analysis. The sample cohort had a mean age of 50 years (range: 19-91); 86.6% were male and 76.3% were unvaccinated. The NP viral load was higher in people with respiratory symptoms ( = 0.0004) and fevers ( = 0.0006). In the predictive models for the clinical outcomes, the NP viral load approached a significance as a predictor for in-hospital mortality. In conclusion, the NP viral load did not appear to be a strong predictor of moderate-to-severe disease in the pre-Delta and Delta phases of the pandemic, but was predictive of symptomatic diseases and approached a significance for in-hospital mortality, providing support to the thesis that early viral control prevents the progression of disease.

摘要

鼻咽(NP)SARS-CoV-2 病毒载量与临床结局之间的关系仍存在争议。在这里,我们研究了可能预测 NP 病毒载量的因素以及病毒载量作为临床结局预测因子的作用。对 2020 年 11 月 18 日至 2021 年 9 月 26 日期间常规护理中收集的 955 个阳性剩余 NP 拭子洗脱液样本的便利样本进行了编目,并进行了图表审查。对于具有可用人口统计学和临床数据的非重复样本(即非员工),将洗脱液的等分试样用于进行 SARS-CoV-2 病毒载量的液滴数字 PCR 定量。进行单变量和多变量分析,以确定 NP 病毒载量的临床预测因子以及与 COVID-19 相关的临床结局的预测因子。最终分析包括 698 个人的样本和数据。样本队列的平均年龄为 50 岁(范围:19-91);86.6%为男性,76.3%未接种疫苗。有呼吸道症状(=0.0004)和发热(=0.0006)的人 NP 病毒载量更高。在预测临床结局的模型中,NP 病毒载量接近作为住院死亡率的预测因子的显著性。总之,在大流行的 Delta 前和 Delta 阶段,NP 病毒载量似乎不是中重度疾病的强预测因子,但与有症状疾病相关,并接近住院死亡率的显著性,这支持了早期病毒控制可预防疾病进展的论点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee0e/9961727/6de751156bb2/viruses-15-00446-g001.jpg

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