Rich Dynamics of an Epidemic Model with Saturation Recovery

Figure 3

The phase portraits of the model where the directions of trajectories are counterclockwise.

(a) 𝐻(𝐼^∗,𝑐)>0 and ℝ₀>1

(b) 𝐻(𝐼^∗,𝑐)<0 and ℝ₀>1

(c) 𝐻(𝐼^∗,𝑐)>0 and ℝ₀<1

(d) 𝐻(𝐼^∗,𝑐)<0 and ℝ₀<1