Analysis of a Dengue Disease Model with Nonlinear Incidence

Figure 6

Backward bifurcation diagram for 𝛿>1 for the parameter values 𝑏₁=240,  𝜆₁=0.00012,  𝛼=0.08,  𝜇₁=0.16,  𝛾=0.015,  𝜆₂=0.0001,  𝑏₂=550,  𝜇₂=0.5.