On the Existence of Equilibrium Points, Boundedness, Oscillating Behavior and Positivity of a SVEIRS Epidemic Model under Constant and Impulsive Vaccination

Advances in Difference Equations

Ravi P. Agarwal¹  A. Ibeas²  M. De la Sen³  S. Alonso-Quesada⁴ 

[1] Department of Electricity and Electronics, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain;Department of Mathematical Sciences, Florida Institute of Technology, Melbourne, USA;Institute of Research and Development of Processes, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain;Mathematics and Statistics Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

关键词: Equilibrium Point;    Epidemic Model;    Endemic Equilibrium;    Susceptible Population;    Infected Population;   

DOI  :  10.1155/2011/748608

学科分类：数学（综合）

来源: SpringerOpen

【 摘 要 】

This paper discusses the disease-free and endemic equilibrium points of a SVEIRS propagation disease model which potentially involves a regular constant vaccination. The positivity of such a model is also discussed as well as the boundedness of the total and partial populations. The model takes also into consideration the natural population growing and the mortality associated to the disease as well as the lost of immunity of newborns. It is assumed that there are two finite delays affecting the susceptible, recovered, exposed, and infected population dynamics. Some extensions are given for the case when impulsive nonconstant vaccination is incorporated at, in general, an aperiodic sequence of time instants. Such an impulsive vaccination consists of a culling or a partial removal action on the susceptible population which is transferred to the vaccinated one. The oscillatory behavior under impulsive vaccination, performed in general, at nonperiodic time intervals, is also discussed.

【 授权许可】

CC BY