Abstract

A mathematical model consisting of two systems of Hepatitis B virus (HBV) infection is set up based on the model of
virus dynamics and experimental observation of anti-viral drug therapy for HBV infection patients provided by Nowak. A
mathematical analysis of dynamic behaviors shows that the model has two kinds of equilibrium points, which represent the
patients’ complete recovery and HBV persistent infection at the end of the treatment with drug lamivudine, respectively.
Our model may provide possible quantitative interpretations for the long-time treatments of chronic HBV infections with
the drug lamivudine according to different model parameters, in particularly it may explain why the plasma virus of
Nowak et al’s patients turnover the original level after stopping the lamivudine treatment.

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