Perturbative solution to susceptible-infected-susceptible epidemics on networks.

Lloyd Sanders, Bo Söderberg, Dirk Brockmann, Tobias Ambjörnsson

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Herein we provide a closed form perturbative solution to a general M-node network susceptible-infected-susceptible (SIS) model using the transport rates between nodes as a perturbation parameter. We separate the dynamics into a short-time regime and a medium-to-long-time regime. We solve the short-time dynamics of the system and provide a limit before which our explicit, analytical result of the first-order perturbation for the medium-to-long-time regime is to be employed. These stitched calculations provide an approximation to the full temporal dynamics for rather general initial conditions. To further corroborate our results, we solve the mean-field equations numerically for an infectious SIS outbreak in New Zealand (NZ, Aotearoa) recomposed into 23 subpopulations where the virus is spread to different subpopulations via (documented) air traffic data, and the country is internationally quarantined. We demonstrate that our analytical predictions compare well to the numerical solution.
Original languageEnglish
Article number032713
JournalPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Issue number3
Publication statusPublished - 2013

Subject classification (UKÄ)

  • Biophysics


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