Qualitative Analysis of an SEIR Model with Varying Total Population Size and Vaccination

摘要

An SEIR model with varying total population size and continuous vaccination is proposed. The stability of the disease-free equilibrium is discussed, and the global stability of the disease-free equilibrium is discussed with the Lasalle's invariance principle. Using analytical methods, the existence and uniqueness of the positive equilibrium are obtained, and it's stability is also discussed by Routh-Hurwith criterion. Finally, numerical simulations are also included.