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Global Stability of a Delayed Endemic Model

WANG Wendi(Faculty of Science, Xi'an Jiaotong University, Xi'an 710049)  
Global stability of an SEIS epidemic model is studied in this paper. By constructing Liqpunov functionals, it is shown that endemic equilibrium is globally stable if latent period is small, infection period is large, and reproduction number is greater than 1 or is near 1.
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