Backward Bifurcation of an Epidemic Model with Infectious Force in Infected and Immune Period and Treatment

Figure 4

The phase diagram of system (1.4) when 𝐼₀=5, 𝐴=80, 𝛽₁=0.015, 𝛽₂=0.001, 𝛾=0.01, 𝑑=0.8, 𝜖=0.01, 𝑟=1, 𝑝₀=0.8607, 𝑝₁=0.6589, 𝑝₂=1.1016, 𝑅₀=0.8935.