Figure 1

Quantitative characterization of impacts of the selection strength β on epidemic spreading for partial- and free-subsidy policies for small vaccination cost.

For homogeneous small-world networks (HSWN) and cost of vaccination c = 0.5, vaccination coverage (V, top panels) and epidemic size (R, bottom panels) for the two subsidy policies for δ = 0.1, 0.4 and 0.7 (corresponding to the left, central and right panels, respectively). Insets in the top panels show the difference in the vaccination coverage, V_P − V_F, between the partial- and free-subsidy policies. Insets in the bottom panels display the difference in epidemic size, R_P − R_F, between the two subsidy policies. Blue squares in the insets are simulation results and the red circles are the theoretical predictions based on the mean-field method (see analysis in Methods). Other parameters are: network size N = 1000, transmission rate λ = 0.072 and average degree .