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arXiv 0709.3049q-bio.PE
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地方病SIS模型中的流行规模

Epidemic Size in the Sis Model of Endemic Infec- Tions

David A. Kessler

摘要:

我们研究了地方性传染病传播的易感-感染-易感模型。我们计算了一个精确的表达式的平均传播数的所有值的人口和传染性。我们推导出大N渐近行为的传染性低于,高于,和在临界区域。我们得到一个解析表达式的概率分布的传输次数,n,在临界区域。我们发现,这个分布有一个$n^3/2$奇异性小n和指数衰减大n。指数随着距离阈值的距离而减小,远低于阈值时发散到无穷大,远高于阈值时接近零。

英文摘要:

We study the Susceptible-Infected-Susceptible model of the spread of an endemic infection. We calculate an exact expression for the mean number of transmissions for all values of the population and the infectivity. We derive the large-N asymptotic behavior for the infectivitiy below, above, and in the critical region. We obtain an analytical expression for the probability distribution of the number of transmissions, n, in the critical region. We show that this distribution has a $n^3/2$ singularity for small n and decays exponentially for large n. The exponent decreases with the distance from threshold, diverging to infinity far below and approaching zero far above.

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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