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\textbf{Fig. 2} The effect of varying the time step $\Delta t$ on the infectivity $x(t)$, the remaining bacteria $b(t)$ and the ruffling fraction $r(t). $r(t)$.  The values used for integration were 100 MOI, $f = 0.7$, $\Gamma_0 = 0.02$, $\Gamma_1 = 0.1$ and $t_{\mathrm{max}}' = 10.0$