SEIR Computer Virus Propagation Model Based on Direct Immunization

The research on the features of computer virus can provide the theory basis for controlling the computer viruses.According to the latent features of computer virus，a SEIR computer virus propagation model is put forward based on direct immunization.Using the theory of differential equation，it indicates that the value of threshold R0 play a role in the spreading of computer virus.Through improving immunization rates，R0 can be controlled effectively，and further control the spreading of computer virus.Though qualitative analysis proved that：1) The virus free equilibrium P0 is locally asymptotically stable if R0<1.whereas is unstable if R0>1 and =2) the viral equilibrium P*is locally asymptotically stable if R0>1.Numerical simulations are given to support results of 1) and 2).