Dynamical Behavior of a New Epidemiological Model

Abstract EN

A new epidemiological model is introduced with nonlinear incidence, in which the infected disease may lose infectiousness and then evolves to a chronic noninfectious disease when the infected disease has not been cured for a certain time τ.

The existence, uniqueness, and stability of the disease-free equilibrium and endemic equilibrium are discussed.

The basic reproductive number R0 is given.

The model is studied in two cases: with and without time delay.

For the model without time delay, the disease-free equilibrium is globally asymptotically stable provided that R0≤1; if R0>1, then there exists a unique endemic equilibrium, and it is globally asymptotically stable.

For the model with time delay, a sufficient condition is given to ensure that the disease-free equilibrium is locally asymptotically stable.

Hopf bifurcation in endemic equilibrium with respect to the time τ is also addressed.