Greenhalgh, D. and Griffiths, M. (2009) Backward bifurcation, equilibrium and stability phenomena in a threestage extended BRSV epidemic model. Journal of Mathematical Biology, 59 (1). pp. 136. ISSN 03036812

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Abstract
In this paper we consider the phenomenon of backward bifurcation in epidemic modelling illustrated by an extended model for Bovine Respiratory Syncytial Virus (BRSV) amongst cattle. In its simplest form, backward bifurcation in epidemic models usually implies the existence of two subcritical endemic equilibria for R 0 < 1, where R 0 is the basic reproductive number, and a unique supercritical endemic equilibrium for R 0 > 1. In our threestage extended model we find that more complex bifurcation diagrams are possible. The paper starts with a review of some of the previous work on backward bifurcation then describes our threestage model. We give equilibrium and stability results, and also provide some biological motivation for the model being studied. It is shown that backward bifurcation can occur in the threestage model for small b, where b is the common per capita birth and death rate. We are able to classify the possible bifurcation diagrams. Some realistic numerical examples are discussed at the end of the paper, both for b small and for larger values of b.
Item type:  Article 

ID code:  14032 
Keywords:  backward bifurcation, equilibrium and stability analysis, basic reproduction ratio, simulation, three stage model, bovine respiratory syncytial virus, Mathematics, Modelling and Simulation, Applied Mathematics, Agricultural and Biological Sciences (miscellaneous) 
Subjects:  Science > Mathematics 
Department:  Faculty of Science > Mathematics and Statistics Faculty of Science > Mathematics and Statistics > Statistics and Modelling Science 
Depositing user:  Mrs Ann Lynch 
Date Deposited:  08 Jan 2010 17:29 
Last modified:  15 Apr 2015 11:07 
URI:  http://strathprints.strath.ac.uk/id/eprint/14032 
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