摘要
讨论了一类脉冲接种和具有双时滞的SEIR模型,得到了其无病周期解。结果表明:接种率R*<1时,疾病消除;接种率R*>1时,疾病将成为地方病。
In this paper,an SEIR epidemic model with two time delays and pulse vaccination is formulated.The exact infection-free periodic solution of the impulse epidemic system is obtained.Moreover,we show that,if R＊1,the infectious population disappear so the disease dies out.while if R＊1,the infectious population persist.
出处
《长治学院学报》
2012年第2期40-44,共5页
Journal of Changzhi University
关键词
脉冲
时滞
阈值
mpulse
time delay
threshold
