Figure 3.

(a) Dependency of transmission rate $\beta$ to $D$ and $V$, by taking ${\beta }^{*}=0.444$, $v=7.680$, $w=0.051$ and $D^{*}=0.7$ m; (b) Effect of $K$ and $I$ to the rate of transmission by taking ${\gamma }_1=1/6$ (infection period of 6 days) and ${\gamma }_0=1/14$ (infection period of 14 days).