Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27504
Title: Oscillations and phase transition in the mean infection rate of a finite population
Authors: Wu, Q
Fu, X
Zhang, H
Small, M
Keywords: Complex networks
epidemic dynamics
susceptibility and infectiousness
Issue Date: 2010
Publisher: World Scientific Publ Co Pte Ltd
Source: International journal of modern physics c, 2010, v. 21, no. 10, p. 1207-1215 How to cite?
Journal: International Journal of Modern Physics C 
Abstract: We consider epidemic transmission in a finite population with both scale-free network structure and heterogeneous infection rates related to both susceptibility and infectiousness of individuals. The restriction to a finite population size and heterogeneity are included so that the model more closely matches reality. In particular, the arithmetic average behavior of heterogeneous infection rates with node-degree correlation is discussed. Through numerical simulations, we find that the average infection rate presents robust small-amplitude oscillations. Based on this property, we propose a statistical measure of the system dynamics the epidemic spreading efficiency (ESE) and discuss its phase transitions as a function of the various system parameters. The results show that the ESE presents a non-continuous phase transition and the ESE threshold is an extension of the epidemic threshold from the case of homogeneous infection rate (for homogeneous populations, the two quantities exhibit the same behavior). By comparing the ESE threshold and the epidemic threshold, we find that ESE threshold is larger than epidemic threshold for a sufficiently large network size. This implies that the traditional homogeneous assumption of infection rates in many epidemiological models overestimates the likelihood of epidemic disease survival.
URI: http://hdl.handle.net/10397/27504
DOI: 10.1142/S0129183110015774
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