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

Figure 3

Topological structure of system (3.1) at (𝑏/𝑑,0) and (𝑥^∗,𝑦^∗) when 𝑅₀>1, where 𝑏=1,𝑑=1,𝑘=2,𝛾=0.5,𝛼=1,𝜇=0.5.