arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.07827q-bio.PEecon.GNphysics.soc-phq-fin.EC
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COVID-19:$R_0$在爆发规模较大的地方较低

COVID-19: $R_0$ is lower where outbreak is larger

Pietro Battiston, Simona Gamba

摘要:

我们使用意大利伦巴第大区(受COVID-19疫情影响最严重的地区)的每日数据,对每个城市单独校准SIR模型。这些都由同一个卫生系统覆盖,在我们关注的封锁后阶段,所有这些都受到相同的社交距离规定的约束。我们发现,在分析期开始时病例数较高的城市扩散率较低,这不能归因于群体免疫。特别是,有一个强大的和非常显着的负相关性之间的估计基本繁殖数($R_0$)和初始爆发规模,在相反的作用$R_0$作为一个\emph{predictor}的爆发规模。我们探讨了对这一现象的不同可能解释,并得出结论,更多的病例会导致行为的改变,例如在人群中采取更严格的社交距离措施,从而减少传播。这一结果要求透明、实时地分发详细的流行病学数据,因为这些数据会影响受疫情影响地区人口的行为。

英文摘要:

We use daily data from Lombardy, the Italian region most affected by the COVID-19 outbreak, to calibrate a SIR model individually on each municipality. These are all covered by the same health system and, in the post-lockdown phase we focus on, all subject to the same social distancing regulations. We find that municipalities with a higher number of cases at the beginning of the period analyzed have a lower rate of diffusion, which cannot be imputed to herd immunity. In particular, there is a robust and strongly significant negative correlation between the estimated basic reproduction number ($R_0$) and the initial outbreak size, in contrast with the role of $R_0$ as a \emph{predictor} of outbreak size. We explore different possible explanations for this phenomenon and conclude that a higher number of cases causes changes of behavior, such as a more strict adoption of social distancing measures among the population, that reduce the spread. This result calls for a transparent, real-time distribution of detailed epidemiological data, as such data affects the behavior of populations in areas affected by the outbreak.

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。

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