Figure 5From: Complex dynamics in an SIS epidemic model with nonlinear incidenceWhen \(R_{0}=1\), and \(\varLambda>(1-\sigma)/a\). (a) When \(R_{0}=1\), \(\varLambda>\frac{1-\sigma}{a}\) and \(\psi_{4}>0\), there exists a stable limit cycle. (b) When \(R_{0}>1\) and \(\psi_{5}>0\), there exists a stable limit cycleBack to article page