Figure 2.

Solution curves for the model (3.1) with the parameter values specified in table 3 (birth rate for Canada). The initial conditions were $(S,I_{\mathrm{m}},I_{\mathrm{s}})/N=(0.9999,0.00008,0.00002)$. Panel (b) shows the proportions in the removed compartments (approximately cumulative incidence in those compartments), which converge to the indicated values derived in equation (4.18).