Figure 4

Solutions of system (5)–(6) with gamma distributed parameter β on [0.1, ∞). Uninfected cells, X(t), infected cells, Y(t), and the total tumor load, X(t) + Y(t), are shown in blue, green, and black, respectively. The initial conditions are X(0) = 0.5, Y(0) = 0.1, parameter values γ = 0.5, δ = 0.3. The initial mean of distribution E _β (0) = 3.5, the initial variances 1.5 (a) and 0.5(b).