Figure 5.

A simulation of typical solution of systems (9) and (10) with C_TH = 200 and C^TH = 700 for Case 1. The parameter values are given in Table 1 with η_RT = η_{P I} = 0.6. (A) Time series of total CD4⁺ T cell population; (B) Time series of healthy CD4⁺ T cell population (dashed line) and infected CD4⁺ T cell population (solid line); (C) Durations of drug on and drug off for each drug-on/off switch; (D) Phase plane plot of healthy CD4⁺ T cell and infected CD4⁺ T cell populations