Fig. 7.

(a) Graph of the optimal vaccination rate ${\psi }_{NE}$ as a function of the relative cost of vaccination $C^v$ when the basic reproduction number ${\mathcal{R}}_0$ is $1.5,2,2.5,\mathrm{and}3$, where $\mathit{\delta }=0.7$. (b) Graph of the optimal level of social distancing ${\eta }_{NE}$ as a function of the relative cost of social distancing $C^{\eta }$.