Article,

Nature of the Epidemic Threshold for the Susceptible-Infected-Susceptible Dynamics in Networks

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Physical Review Letters, (Aug 21, 2013)
DOI: 10.1103/PhysRevLett.111.068701

Abstract

We develop a analytical approach to the susceptible-infected-susceptible epidemic model that allows us to unravel the true origin of the absence of an epidemic threshold in heterogeneous networks. We find that a delicate balance between the number of high degree nodes in the network and the topological distance between them dictates the existence or absence of such a threshold. In particular, small-world random networks with a degree distribution decaying slower than an exponential have a vanishing epidemic threshold in the thermodynamic limit.

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