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

Figure 2

The numerical solution of system (1.4) with 𝛼=1,𝛽=1,𝛾=0.5,𝑟₁=0.5,𝑟₂=1,𝑟₃=1,𝑟=0.5,𝑎=2,𝑏=2,𝜏=1;(𝜙₁,𝜙₂,𝜙₃,𝜓)=(20,2,6,15).