Global Dynamics of an Epidemic Model with a Ratio-Dependent Nonlinear Incidence Rate

Figure 1

Topological structure of system (3.1) at (𝑏/𝑑,0) when 𝑅₀<1, where 𝑏=1,𝑑=1,𝑘=1,𝛾=1,𝛼=1,𝜇=1.