Guerrero-Flores, ShadayOsuna, OsvaldoVargas-de-Leon, Cruz2021-12-012021-12-012019-07-24Guerrero-Flores, S., Osuna, O., & Vargas-de-León, C. (2019). Periodic solutions for seasonal SIQRS models with nonlinear infection terms. <i>Electronic Journal of Differential Equations, 2019</i>(92), pp. 1-13.1072-6691https://hdl.handle.net/10877/14980In this work, we considered a family of SIRS models for a fatal disease, with seasonal variation in the contact rate and isolation control strategies. We establish the existence of periodic orbits of seasonal SIQRS disease, by using Leray-Schauder degree theory. Examples related to the seasonal variation in respiratory syncytial virus infection are included.Text13 pages1 file (.pdf)enAttribution 4.0 InternationalLeray-Schauder degreeSIQRS modelsPeriodic orbitsArticle