Figure 6.

The diagram displays the appearance of the co-existence of wt and mut Yersinia strains as ${\alpha }^{\left(B\right)}$ is changing in a region where ${\mathcal{R}}_0^{wt}>1$ and ${\mathcal{R}}_0^{mut}>1$. (a) An immune reaction influences the wt and mut Yersinia strains in the mucosa. Additionally, another part is spilled over and moves to the lumen compartment. Therefore, they simultaneously increase or decrease to reach their maximum values. (b) The wt and mut Yersinia strains in the lumen simultaneously increase to reach the carrying capacity of the lumen compartment. In both (a,b), when ${\alpha }^{\left(B\right)}$ reaches 4.90, the co-existence of wt and mut Yersinia strains disappears.