FIG. 1.

The contour plot of the maximal infection density $I_{\text{max}}$, where the x coordinate is the response rate δ and the y coordinate is the spreading rate λ on a BA network with the mean degree $⟨k⟩\cong 12$ (a) (b) and an ER network with $p=0.006$ (c) (d). Plots (a) and (c) denote the Monte Carlo simulations and plots (b) and (d) represent the Markov chain predictions (5). In all simulations the recover rate $\gamma =1$. The bottom line in each plot forms the boundary between the epidemic outbreak and the epidemic extinction.