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Math Biosci Eng. 2005 Apr;2(2):317-27.

Thresholds for epidemic outbreaks in finite scale-free networks.

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Istituto Nazionale di Ottica Applicata, Largo E. Fermi, 6 50125 Florence, Italy.


We numerically investigate the existence of a threshold for epidemic outbreaks in a class of scale-free networks characterized by a parametri- cal dependence of the scaling exponent, influencing the convergence of fluctuations in the degree distribution. In finite-size networks, finite thresholds for the spreading of an epidemic are always found. However, both the thresholds and the behavior of the epidemic prevalence are quite diferent with respect to the type of network considered and the system size. We also discuss agreements and diferences with some analytical claims previously reported.

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