A mathematical model of chikungunya dynamics and control: the major epidemic on Réunion Island.

A mathematical model of chikungunya dynamics and control: the major epidemic on Réunion Island.
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DOI:
10.1371/journal.pone.0057448
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Clements AC
Clements AC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yakob L;Clements AC

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基孔肯雅热是由伊蚊传播的一种新出现的虫媒病毒病。蚊子。虽然主要是非洲和亚洲的地方性疫情,但在归国旅行者介绍之后,最近的疫情也发生在欧洲。留尼汪岛2006年发生了一次特别大的疫情,公布的数据构成了本研究的基础。建立了一个简单的、确定性的病毒在人和蚊子之间传播的数学模型,并用最新的感染生物学文献进行了参数化。该模型适用于大规模留尼汪岛疫情,结果估计基孔肯雅病的类型繁殖数为4.1。尽管该模型过于简单,但它提供了疫情高峰发病率和最终疫情规模的近似值。用蒙特卡罗模拟进行的敏感性分析表明,人类感染潜伏期和潜伏期对这两种流行病学结果都有很强的影响。我们展示了为什么分离这些在基孔肯雅热感染中具有流行病学差异的变量不仅对于精确的模型拟合是必要的,而且在告知控制方面也是重要的。
Chikungunya is a re-emerging arboviral disease transmitted by Aedes spp. mosquitoes. Although principally endemic to Africa and Asia, recent outbreaks have occurred in Europe following introductions by returning travellers. A particularly large outbreak occurred on Réunion Island in 2006, the published data from which forms the basis of the current study. A simple, deterministic mathematical model of the transmission of the virus between humans and mosquitoes was constructed and parameterised with the up-to-date literature on infection biology. The model is fitted to the large Réunion epidemic, resulting in an estimate of 4.1 for the type reproduction number of chikungunya. Although simplistic, the model provided a close approximation of both the peak incidence of the outbreak and the final epidemic size. Sensitivity analysis using Monte Carlo simulation demonstrated the strong influence that both the latent period of infection in humans and the pre-patent period have on these two epidemiological outcomes. We show why separating these variables, which are epidemiologically distinct in chikungunya infections, is not only necessary for accurate model fitting but also important in informing control.
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