Backward Bifurcation of an Epidemic Model with Infectious Force in Infected and Immune Period and Treatment

Figure 3

The figure of 𝐼_∗, 𝐼₁ and 𝐼₂ versus 𝑅₀ that shows a backward bifurcation with endemic equilibrium when 𝑅₀<1, where Corollary 2.3 holds.