Fig. 3.

Variation in mean $R_0$ and disease specifics with the threshold level $I_{\mathrm{c}}$ for four different cases. The baseline parameter values in this subsection are fixed as follows: $N=763$ with spatial grid $[0,20]\times [0,20]$, $\beta =0.025,\alpha =3.5,\gamma =0.17$, and $I_0=1$. $\mathrm{\Delta }=0.06,\sigma =0.66$ with $V_0=0.005$, cluster radius $r=0.5$ (Color figure online)