Epidemic threshold for the susceptible-infectious-susceptible model on random networks

Roni Parshani, Shai Carmi, Shlomo Havlin

Research output: Contribution to journalArticlepeer-review

171 Scopus citations


We derive an analytical expression for the critical infection rate rc of the susceptible-infectious-susceptible (SIS) disease spreading model on random networks. To obtain rc, we first calculate the probability of reinfection π, defined as the probability of a node to reinfect the node that had earlier infected it. We then derive rc from π using percolation theory. We show that π is governed by two effects: (i) the requirement from an infecting node to recover prior to its reinfection, which depends on the SIS disease spreading parameters, and (ii) the competition between nodes that simultaneously try to reinfect the same ancestor, which depends on the network topology.

Original languageEnglish
Article number258701
JournalPhysical Review Letters
Issue number25
StatePublished - 22 Jun 2010


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