Open Access
Translator Disclaimer
May 2003 Partial immunization processes
Alan Stacey
Ann. Appl. Probab. 13(2): 669-690 (May 2003). DOI: 10.1214/aoap/1050689599


Partial immunization processes are generalizations of the contact process in which the susceptibility of a site to infection depends on whether or not it has been previously infected. Such processes can exhibit a phase of weak survival, in which the process survives but drifts off to infinity, even on graphs such as $\mathbb{Z}^d$, where no such phase exists for the contact process. We establish that whether or not strong survival occurs depends only on the rate at which sites are reinfected and not on the rate at which sites are infected for the first time. This confirms a prediction by Grassberger, Chaté and Rousseau. We then study the processes on homogeneous trees, where the behaviour is also related to that of the contact process whose infection rate is equal to the reinfection rate of the partial immunization process. However, the phase diagram turns out to be substantially richer than that of either the contact process on a tree or partial immunization processes on $\mathbb{Z}^d$.


Download Citation

Alan Stacey. "Partial immunization processes." Ann. Appl. Probab. 13 (2) 669 - 690, May 2003.


Published: May 2003
First available in Project Euclid: 18 April 2003

zbMATH: 1030.60092
MathSciNet: MR1970282
Digital Object Identifier: 10.1214/aoap/1050689599

Primary: 60K35

Keywords: contact process , critical value , immunization , phase diagram , tree , weak survival

Rights: Copyright © 2003 Institute of Mathematical Statistics


Vol.13 • No. 2 • May 2003
Back to Top