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Stability of the Endemic Coexistence Equilibrium for One Host and Two Parasites

Published online by Cambridge University Press:  08 April 2010

T. Dhirasakdanon  and
H. R. Thieme
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Abstract

For an SI type endemic model with one host and two parasite strains, we study the stability of the endemic coexistence equilibrium, where the host and both parasite strains are present. Our model, which is a system of three ordinary differential equations, assumes complete cross-protection between the parasite strains and reduced fertility and increased mortality of infected hosts. It also assumes that one parasite strain is exclusively vertically transmitted and cannot persists just by itself. We give several sufficient conditions for the equilibrium to be locally asymptotically stable. One of them is that the horizontal transmission is of density-dependent (mass-action) type. If the horizontal transmission is of frequency-dependent (standard) type, we show that, under certain conditions, the equilibrium can be unstable and undamped oscillations can occur. We support and extend our analytical results by numerical simulations and by two-dimensional plots of stability regions for various pairs of parameters.

Keywords

coexistence of parasite strainsdisease incidenceSI endemic modelRouth-Hurwitz conditionsundamped oscillationsvertical transmissionhorizontal transmissiondisease-related fertility reduction
Type
Research Article
Information
Mathematical Modelling of Natural Phenomena , Volume 5 , Issue 6: Ecology (Part 2) , 2010 , pp. 109 - 138
Copyright
© EDP Sciences, 2010

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