Optimal Control of the Lost to Follow Up in a Tuberculosis Model

Figure 7

The influence of the control with 𝑆(0)=50, 𝐸(0)=100, 𝐼(0)=150, 𝐿(0)=200, 𝛽=0.02, 𝜙=0.5, and 𝑘₂=0.006. All the other parameter values are as in Table 1.

(a) Control functions

(b) Basic reproduction ratio

(c) Evolution of the lost to follow up