朱春娟
一类具有饱和传染率、免疫接种和垂直传染的SIR传染病模型的全局稳定性分析
朱春娟
(韶关学院数学与统计学院,广东,韶关 512005)
针对一类具有饱和传染率、免疫接种和垂直传染的SIR传染病模型,确定了疾病的基本再生数。得出结论:当疾病的基本再生数小于1时,无病平衡点是全局渐近稳定的,当疾病基本再生数大于1时,地方病平衡点是全局渐近稳定的。
SIR传染病模型;饱和传染率;免疫接种;垂直传染;稳定性
传染病在现实生活中广泛存在,利用动力学方法来研究传染病是非常重要的方法之一[1-3]。在文献[4-9]中研究关于垂直传染的传染病模型,这里认为若新生儿的母亲为染病者,而新生儿却不能接种,但事实上,有些是可以接种的,譬如乙肝等。
基于上述考虑,本文研究了更符合实际生物情况的具有饱和传染率、免疫接种和垂直传染的SIR传染病模型。
为了更符合实际,我们建立的模型中有带有免疫接种的常数输入者,且考虑垂直传染。我们主要讨论以下模型:
结合(2),系统(1)等价于系统
利用再生矩阵的方法,可以得到系统(3)的基本再生数为
把(4)代入系统(3)的第一个方程得
定义
则
由于
则
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Global Stability of a SIR Epidemic Model with Saturating Infect Rate,Vaccination and Vertical Transmission
ZHU Chun-juan
(College of Mathematics and Statistics, Shaoguan University, Shaoguan, Guangdong 512005,China)
In this paper, the SIR epidemic model with saturating infect rate, vaccination and vertical transmission is studied; the basic reproduction numberfor the existence of infectivedisease was established. If, the disease-free equilibrium is global asymptotically stable. If, a unique endemic equilibrium exists and is globally stable in the interior of the feasible region .We discuss the biological significance at the end.
SIR epidemic model; saturating infect rate; vaccination; vertical transmission; equilibrium; global stability
1674-8085(2015)04-0013-04
O175.13
A
10.3969/j.issn.1674-8085.2015.04.003
2015-04-08;修改日期:2015-05-24
韶关市科技计划项目(2014CX/K231)
朱春娟(1982-),女,江苏南通人,讲师,硕士,主要从事生物数学方向研究(zcjyangyang.sina.com).