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Zbl 1209.92035
Huang, Gang; Takeuchi, Yasuhiro; Ma, Wanbiao
Lyapunov functionals for delay differential equations model of viral infections. (English)
[J] SIAM J. Appl. Math. 70, No. 7, 2693-2708 (2010). ISSN 0036-1399; ISSN 1095-712X/e

Summary: We study global properties of a class of delay differential equations model for virus infections with nonlinear transmissions. Compared with the typical virus infection dynamical model, this model has two important and novel features. To give a more complex and general infection process, a general nonlinear contact rate between target cells and viruses and the removal rate of infected cells are considered, and two constant delays are incorporated into the model, which describe (i) the time needed for a newly infected cell to start producing viruses and (ii) the time needed for a newly produced virus to become infectious (mature), respectively. By the Lyapunov direct method and using the technology of constructing Lyapunov functionals, we establish global asymptotic stability of the infection-free equilibrium and the infected equilibrium. We also discuss the effects of two delays on global dynamical properties by comparing the results with the stability conditions for the model without delays. Further, we generalize this type of Lyapunov functional to the model described by $n$-dimensional delay differential equations.

MSC 2000:: *92C60 Medical epidemiology
34K20 Stability theory of functional-differential equations
34K60 Applications of functional-differential equations

Keywords: delay differential equations; Lyapunov functional; viral infection; global stability

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Zentralblatt MATH Berlin [Germany]