Europhys. Lett.
Volume 72, Number 2, October 2005
Page(s) 315 - 321
Section Interdisciplinary physics and related areas of science and technology
Published online 07 September 2005
Europhys. Lett., 72 (2), pp. 315-321 (2005)
DOI: 10.1209/epl/i2004-10550-5

Epidemic spreading in community networks

Zonghua Liu1, 2 and Bambi Hu2, 3

1  Department of Physics, East China Normal University - Shanghai 200062, PRC
2  Department of Physics, Center for Nonlinear Studies, and the Beijing-Hong Kong-Singapore Joint Center for Nonlinear and Complex Systems (Hong Kong Branch) Hong Kong Baptist University, Hong Kong, PRC
3  Department of Physics, University of Houston - Houston, TX 77204-5005, USA

received 4 November 2004; accepted in final form 5 August 2005
published online 7 September 2005

Social networks have the structure of communities. To understand how the community structure affects epidemic spreading, we present a simplified model of community network, and investigate the epidemic propagation in this model. We find that, compared to the random network, the community network has a broader degree distribution, a smaller threshold of epidemic outbreak, and more prevalence to keep the outbreak endemic. The formulae of epidemic threshold are given and confirmed by numerical simulations.

89.75.Hc - Networks and genealogical trees.
87.23.Ge - Dynamics of social systems.

© EDP Sciences 2005