Fig. 1. Schematic diagram of our virus infection model.

Fig. 2. Sample path x(t), y(t), z(t) and its corresponding Markov chain r(t) for the stochastic virus infection model (3), using the parameters c₁ = 0.0100 and c₂ = 0.0150: (a) λ₁ = 0.7130, λ₂ = 0.5181, β₁ = 0.0123, β₂ = 0.0115, δ₁ = 0.2861, δ₂ = 0.3743, a₁ = 1.523, and a₂ = 1.636, (b) λ₁ = 0.7130, λ₂ = 0.5181, β₁ = 0.0123, β₂ = 0.0115, δ₁ = 0.2861, δ₂ = 0.0101, a₁ = 1.523, a₂ = 0.401, with the initial value (x(0),y(0),z(0)) = (1.5,9,5), and the exponential distribution for the switching times of r(t), with r(0) = 1.

Fig. 3. Sample path x(t), y(t), z(t) for the stochastic virus infection model (3) for parameters λ₁ = 0.2134, λ₂ = 0.3340, β₁ = 0.6223, β₂ = 0.5159, δ₁ = 0.4123, β₂ = 0.2061, a₁ = 0.101, a₂ = 0.201, c₁ = 0.1100, and c₂ = 0.1150, with the initial value (x(0),y(0),z(0)) = (1.5,9,5).

Table 1. Some parameters of the system (2). All parameters are supposed to be nonnegative.