Figure 2

Solutions of system (5)–(6) with gamma distributed parameter β on [1.5, ∞). 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 X(0) = 0.5, Y(0) = 0.1, parameter values γ = 1, δ = 2. The initial mean of distribution E _β (0) = 2.5, the initial variances 0.06 (a), 0.1(b), 0.3(c), 0.4(d).