摘要：A delayed SEIRS epidemic model with pulse vaccination
and nonlinear incidence rate is proposed. We analyze the dynamical behaviors of this
model and point out that there exists an infection-free periodic solution which is globally
attractive if 𝑅1<1, 𝑅2>1, and the disease is permanent. Our results indicate
that a short period of pulse or a large pulse vaccination rate is the sufficient condition
for the eradication of the disease. The main feature of this paper is to introduce time
delay and impulse into SEIRS model and give pulse vaccination strategies.
