RT Journal Article T1 A Viral Infection Model with a Nonlinear Infection Rate A1 Yu, Yumei A1 Nieto Roig, Juan José A1 Torres Iglesias, Ángela J. A1 Wang, Kaifa K1 Basic Reproduction Number K1 Homoclinic Bifurcation K1 Infection Equilibrium K1 Viral Infection Model K1 Degenerate Singular Point AB A viral infection model with a nonlinear infection rate is constructed based on empirical evidences. Qualitative analysis shows that there is a degenerate singular infection equilibrium. Furthermore, bifurcation of cusp-type with codimension two (i.e., Bogdanov-Takens bifurcation) is confirmed under appropriate conditions. As a result, the rich dynamical behaviors indicate that the model can display an Allee effect and fluctuation effect, which are important for making strategies for controlling the invasion of virus. PB SpringerOpen SN 1687-2770 YR 2009 FD 2009 LK http://hdl.handle.net/10347/22842 UL http://hdl.handle.net/10347/22842 LA eng NO Yu, Y., Nieto, J., Torres, A., & Wang, K. (2009). A viral infection model with a nonlinear infection rate. Boundary Value Problems, 2009(1), 958016. NO This work is supported by the National Natural Science Fund of China nos. 30770555 and10571143, the Natural Science Foundation Project of CQ CSTC 2007BB5012, and the ScienceFund of Third Military Medical University 06XG001 DS Minerva RD 22 abr 2026