we investigate two classes of discrete SIRS epidemic models. By inductive method
the positive and the boundedness of the solution are obtained. By constructing new Lyapunov functions
the criterion of the global asymptotic stability of the disease-free equilibrium and the endemic equilibrium for these epidemic models is obtained.It is showed that the global dynamics of each discrete SIRS epidemic model is fully determined by a threshold R0
then endemic equilibrium is globally asymptotically stable.
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references
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