Stability Analysis of a Delayed SIR Epidemic Model with Stage Structure and Nonlinear Incidence

Figure 1

The numerical solution of system (1.4) with 𝛼=1,𝛽=2,𝛾=0.5,𝑟₁=3,𝑟₂=1,𝑟₃=0.5,𝑟=1,𝑎=6,𝑏=2,𝜏=1; (𝜙₁,𝜙₂,𝜙₃,𝜓)=(15,3,4,10).