Bai, LiangNieto, Juan J.Uzal Couselo, José Manuel2024-02-082024-02-082020Bai, L., Nieto, J. J., & Uzal, J. M. (2020). On a delayed epidemic model with non-instantaneous impulses. Communications On Pure &Amp Applied Analysis, 19(4), 1915-1930. https://doi.org/10.3934/cpaa.20200841553-525810.3934/cpaa.2020084https://hdl.handle.net/20.500.14352/100589We introduce a non-instantaneous pulse vaccination model. Non-instantaneous impulsive nonlinear differential equations provide an adequate biomathematical model of some medical problems. In this paper we study some basic properties such as the attractiveness of the infection-free periodic solution and the permanence of some sub-population for a vaccine model where a constant fraction of the susceptible population is vaccinated in some periodic way. Our model is a system of nonlinear differential equations with impulses.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal articlehttps//doi.org/10.3934/cpaa.2020084https://www.aimsciences.org/article/doi/10.3934/cpaa.2020084restricted accessMatemáticas (Matemáticas)12 Matemáticas