Fig. 2.

Simulations of a non-prophylactic majority initial distribution of the susceptible population ($S_{-2}=S_{-1}=0.15$ and $S_1=S_2=0.345$), given an initial infectious population of $I=0.01$. Colour legend: red curves are $S_2$ (solid) and $S_1$ (dashed). Blue curves are $S_{-2}$ (solid) and $S_{-1}$ (dashed). Black and purple curves are I(t) and R(t), respectively. Influence functions were a no influence and all susceptible individuals in the $S_2$ population ($S_2=0.99$, $S_i=0\forall i\ne 2$), b no influence ($w_i=0$), c linear, d saturating, e fixed-order saturating, and f reverse-order saturating. Influence functions c–f are defined in Table 1. Parameter values are at the defaults listed in Table 2 (Color figure online)