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An SEIV epidemic model for childhood disease with partial permanent immunity is studied. The basic reproduction number  R   0  has been worked out. The local and global asymptotical stability analysis of the equilibria are performed, respectively. Furthermore, if we take the treated rate  τ  as the bifurcation parameter, periodic orbits will bifurcate from endemic equilibrium when  τ  passes through a critical value. Finally, some numerical simulations are given to support our analytic results.

An SEIV Epidemic Model for Childhood Diseases with Partial Permanent Immunity