arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2203.07063q-bio.PEq-bio.QM
收藏

根据接触者追踪数据估计SARS-CoV-2 α和δ变体的潜伏期和生成时间

Estimation of the incubation period and generation time of SARS-CoV-2 Alpha and Delta variants from contact tracing data

Mattia Manica, Maria Litvinova, Alfredo De Bellis, Giorgio Guzzetta, Pamela Mancuso, Massimo Vicentini, Francesco Venturelli, Eufemia Bisaccia, Ana I. Bento, Pi… 展开作者

Mattia Manica, Maria Litvinova, Alfredo De Bellis, Giorgio Guzzetta, Pamela Mancuso, Massimo Vicentini, Francesco Venturelli, Eufemia Bisaccia, Ana I. Bento, Piero Poletti, Valentina Marziano, Agnese Zardini, Valeria d'Andrea, Filippo Trentini, Antonino Bella, Flavia Riccardo, Patrizio Pezzotti, Marco Ajelli, Paolo Giorgi Rossi, Stefano Merler, the Reggio Emilia COVID-19 Working Group

摘要:

背景于二零二一年,COVID-19疫情的特点是出现适应性增强的谱系。对于大多数这些变异体,关于流行病学数量的定量信息很少,如潜伏期和世代时间,这对公共卫生决策和科学研究都至关重要。法我们分析了整个2021年在意大利雷焦艾米利亚省进行接触者追踪活动期间收集的数据集。我们使用282例有症状病例的阴性PCR检测信息和最后一次暴露日期确定了潜伏期的分布。我们使用贝叶斯推断方法估计了内在世代时间(在完全易感人群中,感染者的感染日期与其继发病例之间的时间)的分布,该方法适用于聚集在1,430个家庭中的4,435例SARS-CoV-2病例,其中至少记录了一例继发病例。结果我们估计α和Delta的平均潜伏期分别为4.9天(95%可信区间,CrI,4.4-5.4;平均分布的95百分位数:1-12)和4.5天(95%CrI 4.0-5.0; 95百分位数:1-10)。α和Delta的固有生成时间估计分别为6.0天(95%CrI 5.6-6.4; 95百分位数:1-15)和6.6天(95%CrI 6.0-7.3; 95百分位数:1-18)。阿尔法和德尔塔的家庭系列间隔分别为2.6天(95%CrI 2.4-2.7)和2.4天(95%CrI 2.2-2.6),两种变体的症状前传播的估计比例为54-55%。结论.这些结果表明,与祖先谱系相比,SARS-CoV-2变体Alpha和Delta的潜伏期和固有世代时间差异有限。

英文摘要:

Background. During 2021, the COVID-19 pandemic was characterized by the emergence of lineages with increased fitness. For most of these variants, quantitative information is scarce on epidemiological quantities such as the incubation period and generation time, which are critical for both public health decisions and scientific research. Method. We analyzed a dataset collected during contact tracing activities in the province of Reggio Emilia, Italy, throughout 2021. We determined the distributions of the incubation period using information on negative PCR tests and the date of last exposure from 282 symptomatic cases. We estimated the distributions of the intrinsic generation time (the time between the infection dates of an infector and its secondary cases under a fully susceptible population) using a Bayesian inference approach applied to 4,435 SARS-CoV-2 cases clustered in 1,430 households where at least one secondary case was recorded. Results. We estimated a mean incubation period of 4.9 days (95% credible intervals, CrI, 4.4-5.4; 95 percentile of the mean distribution: 1-12) for Alpha and 4.5 days (95%CrI 4.0-5.0; 95 percentile: 1-10) for Delta. The intrinsic generation time was estimated to have a mean of 6.0 days (95% CrI 5.6-6.4; 95 percentile: 1-15) for Alpha and of 6.6 days (95%CrI 6.0-7.3; 95 percentile: 1-18) for Delta. The household serial interval was 2.6 days (95%CrI 2.4-2.7) for Alpha and 2.4 days (95%CrI 2.2-2.6) for Delta, and the estimated proportion of pre-symptomatic transmission was 54-55% for both variants. Conclusions. These results indicate limited differences in the incubation period and intrinsic generation time of SARS-CoV-2 variants Alpha and Delta compared to ancestral lineages.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑