Figure 3. Dynamics of the recovered (R) when the density of prevention P_S increases in the SIR model.

(a) The temporal profiles of prevention introduction. (b) The temporal dynamics of the recovered density (R). The final proportion of prevention (site blocked) is set at P_S = 0.5 and the rate τ is defined as the time to reach at P_S = 0.5. Four different delayed times τ of protection are used for comparisons: (1) no delay in prevention corresponding to Fig. 1a (τ = 0; red dashed line), (2) a fast rate (τ = 100; green line), (2) a moderate rate (τ = 500; purple line), and (3) a fast rate (τ = 1000; blue line).