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arXiv 0909.2417q-bio.PEcond-mat.stat-mechphysics.soc-ph
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新型甲型流感(H1N1)的季节性传播潜力和活动高峰:基于人员流动性的Monte Carlo似然分析

Seasonal transmission potential and activity peaks of the new influenza A(H1N1): a Monte Carlo likelihood analysis based on human mobility

Duygu Balcan, Hao Hu, Bruno Goncalves, Paolo Bajardi, Chiara Poletto, Jose J Ramasco, Daniela Paolotti, Nicola Perra, Michele Tizzoni, Wouter Van den Broeck, Vi… 展开作者

Duygu Balcan, Hao Hu, Bruno Goncalves, Paolo Bajardi, Chiara Poletto, Jose J Ramasco, Daniela Paolotti, Nicola Perra, Michele Tizzoni, Wouter Van den Broeck, Vittoria Colizza, Alessandro Vespignani

摘要:

6月11日,世界卫生组织正式将大流行病警戒级别(针对新的H1N1流感毒株)提高到6级。我们使用一个全球结构化集合种群模型,整合了全球范围内的流动性和运输数据,以估计传播潜力和相关的模型参数,我们使用的是2009年新型甲型流感(H1N1)的年表数据。该方法是基于最大似然分析的到达时间分布模型在12个国家播种墨西哥使用1 M计算模拟流行病。一个扩展的年表,包括全球93个国家在6月18日之前播种,用于确定季节性影响。我们发现基本生殖数的最佳估计值R 0 = 1.75(95%CI 1.64至1.88)。相关性分析允许根据观察到的模式选择最可能的季节性行为,从而确定未来大流行演变的合理情景,并估计不同半球的大流行活动高峰。我们提供了下一波的住院人数和发病率的估计,以及对疾病参数值的广泛敏感性分析。我们还研究了抗病毒药物的系统治疗使用对流行时间轴的影响。分析显示,北半球可能在10月/11月出现早期流行高峰,可能在大规模疫苗接种运动之前。我们认为,计划额外的缓解政策,如系统的抗病毒治疗可能是延迟活动高峰的关键,以恢复疫苗接种计划的有效性。

英文摘要:

On 11 June the World Health Organization officially raised the phase of pandemic alert (with regard to the new H1N1 influenza strain) to level 6. We use a global structured metapopulation model integrating mobility and transportation data worldwide in order to estimate the transmission potential and the relevant model parameters we used the data on the chronology of the 2009 novel influenza A(H1N1). The method is based on the maximum likelihood analysis of the arrival time distribution generated by the model in 12 countries seeded by Mexico by using 1M computationally simulated epidemics. An extended chronology including 93 countries worldwide seeded before 18 June was used to ascertain the seasonality effects. We found the best estimate R0 = 1.75 (95% CI 1.64 to 1.88) for the basic reproductive number. Correlation analysis allows the selection of the most probable seasonal behavior based on the observed pattern, leading to the identification of plausible scenarios for the future unfolding of the pandemic and the estimate of pandemic activity peaks in the different hemispheres. We provide estimates for the number of hospitalizations and the attack rate for the next wave as well as an extensive sensitivity analysis on the disease parameter values. We also studied the effect of systematic therapeutic use of antiviral drugs on the epidemic timeline. The analysis shows the potential for an early epidemic peak occurring in October/November in the Northern hemisphere, likely before large-scale vaccination campaigns could be carried out. We suggest that the planning of additional mitigation policies such as systematic antiviral treatments might be the key to delay the activity peak inorder to restore the effectiveness of the vaccination programs.

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