Abstract
The SIR epidemic model for disease dynamics considers recovered individuals to be permanently immune, while the SIS epidemic model considers recovered individuals to be immediately resusceptible. We study the case of temporary immunity in an SIR-based model with delayed coupling between the susceptible and removed classes, which results in a coupled set of delay differential equations. We find conditions for which the endemic steady state becomes unstable to periodic outbreaks. We then use analytical and numerical bifurcation analysis to describe how the severity and period of the outbreaks depend on the model parameters.
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Taylor, M.L., Carr, T.W. An SIR epidemic model with partial temporary immunity modeled with delay. J. Math. Biol. 59, 841–880 (2009). https://doi.org/10.1007/s00285-009-0256-9
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DOI: https://doi.org/10.1007/s00285-009-0256-9