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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