Abstract
An epidemiological model with both a time delay in the removed class and a nonlinear incidence rate is analysed to determine the equilibria and their stability. This model is for diseases where individuals are first susceptible, then infected, then removed with temporary immunity and then susceptible again when they lose their immunity. There are multiple equilibria for some parameter values, and, for certain of these, periodic solutions arise by Hopf bifurcation from the large nontrivial equilibrium state.
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Research supported in parts by Centers for Disease Control Contract 200-87-0515
Research supported in part by NSERC A-8965
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Hethcote, H.W., Lewis, M.A. & van den Driessche, P. An epidemiological model with a delay and a nonlinear incidence rate. J. Math. Biology 27, 49–64 (1989). https://doi.org/10.1007/BF00276080
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DOI: https://doi.org/10.1007/BF00276080