Figure 3From: A delayed SIR model with general nonlinear incidence rate Plots of the infective individuals and corresponding three-dimensional phase for system ( 22 ) with \(\pmb{\sigma_{0}=2.2002}\) and \(\pmb{I^{*}F'(S^{*})=0.0541>2r(1-2S^{*})=0.0192}\) . The initial value is set to be \((0.4, 0.3, 0.25)\) and \(\tau=2.5>\tau_{0}=2.0288\). The values of parameters are as in Figure 1 but \(\gamma=0.35\).Back to article page