Fig. 5.

The effect of parameter D on the number of the infected (a, b) without pathogen growing in reservoir (c, d) with pathogen growing in reservoir given in (6) with $g=1,C=1$. The baseline parameter values are as follows: $\beta =0.025,\gamma =0.17,\alpha =3.5$, and the parameters for individual initial velocity $v_0=0.005,r=0.5$, the shading rate of i-th infected individual is ${\eta }_i=0.6$ with bacteria threshold ($w_0=0.4$). We choose the dispersal rate and cleaning rate for investigating the effects of bacteria on disease spread, where $I_0=5$ (Color figure online)