Analysis of a Dengue Disease Model with Nonlinear Incidence

Figure 2

Phase plot of 𝐼 verses 𝑆 showing stability of unique endemic equilibrium point when 𝑅₀>1 and 𝛿>1 for the parameter values 𝑏₁=80,  𝜆₁=0.0004,  𝛼=0.04,  𝜇₁=0.06,  𝛾=0.015,  𝜆₂=0.0002,  𝑏₂=200,  𝜇₂=0.5.