Figure 5
Uninfected (solid line) and infected (dashed line) cell concentration for an initially infected IDU who begins vitamin supplementation on day 50. In (a), a stable equilibrium results from a supplement of α = 2.0 × 1013 molecules/(μL day) which corresponds to 58 mg of daily vitamin C supplementation. In (b), a periodic cycle appears when α = 4.0 × 1013 molecules/(μL day), corresponding to 116 mg of daily vitamin C supplementation.