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State space collapse for critical multistage epidemics

Published online by Cambridge University Press:  21 March 2016

Florian Simatos*
Affiliation:
Eindhoven University of Technology
*
Current address: ISAE Supaero, Département DISC, 10 avenue Edouard Belin, BP 54032, 31055 TOULOUSE CEDEX 4, France. Email address: florian.simatos@isae.fr
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Abstract

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We study a multistage epidemic model which generalizes the SIR model and where infected individuals go through K ≥ 1 stages of the epidemic before being removed. An infected individual in stage k ∈ {1, …, K} may infect a susceptible individual, who directly goes to stage k of the epidemic; or it may go to the next stage k + 1 of the epidemic. For this model, we identify the critical regime in which we establish diffusion approximations. Surprisingly, the limiting diffusion exhibits an unusual form of state space collapse which we analyze in detail.

Type
General Applied Probability
Copyright
Copyright © Applied Probability Trust 2015 

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