Figure 7.

Disease frequency over time with various levels of assortative meeting. (a) Initial behaviour for a system that starts near the herd-immunity level for measles, with 7.5% of individuals having anti-vaccine sentiment. (b) Disease frequency after 50,000, 75,000 and 100,000 days for a system that starts at the endemic equilibrium. Both panels use measles parameters from Table 4 with c = 0.8 and w = 0.14. These values are chosen so that c is the same as that used in other analyses (Figures 4–6), w is on the same scale as v (Table 4) and the EE is stable (Table 3).