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arXiv 1506.07293physics.soc-phcs.SI
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具有异质感染率的SIS传染病传播

SIS Epidemic Spreading with Heterogeneous Infection Rates

Bo Qu, Huijuan Wang

摘要:

在这项工作中,我们的目标是了解感染率的异质性对易感-感染-易感(SIS)传染病传播的影响。以经典的SIS模型为基准,研究了独立同分布的感染率对处于亚稳态的平均感染率的影响。对数正态分布,伽玛和新设计的分布被认为是感染率。我们发现,当回收率较小时,即在同质和异质两种情况下,传染病的传播都是:1)平均感染率的异质性阻碍了病毒的传播; 2)感染率的偶数阶矩越大,平均感染率越小,但奇数阶矩的贡献则相反;当恢复率很大时,即流行病可能会消亡或感染一小部分人口,感染率的异质性可能会增加流行病蔓延的可能性。最后,我们通过现实世界的网络与他们的异质感染率验证我们的结论。我们的研究结果表明,在现实中,流行病的传播可能并不像经典的SIS模型所表明的那样严重,但消除流行病可能更加困难。

英文摘要:

In this work, we aim to understand the influence of the heterogeneity of infection rates on the Susceptible-Infected-Susceptible (SIS) epidemic spreading. Employing the classic SIS model as the benchmark, we study the influence of the independently identically distributed infection rates on the average fraction of infected nodes in the metastable state. The log-normal, gamma and a newly designed distributions are considered for infection rates. We find that, when the recovery rate is small, i.e.\ the epidemic spreads out in both homogeneous and heterogeneous cases: 1) the heterogeneity of infection rates on average retards the virus spreading, and 2) a larger even-order moment of the infection rates leads to a smaller average fraction of infected nodes, but the odd-order moments contribute in the opposite way; when the recovery rate is large, i.e.\ the epidemic may die out or infect a small fraction of the population, the heterogeneity of infection rates may enhance the probability that the epidemic spreads out. Finally, we verify our conclusions via real-world networks with their heterogeneous infection rates. Our results suggest that, in reality the epidemic spread may not be so severe as the classic SIS model indicates, but to eliminate the epidemic is probably more difficult.

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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