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$N \equiv $ number of host cells  $N_I \equiv $ number of infected cells $N_B \equiv $ number of bacteria remaining (unattached, uninvaded)  $N_R \equiv $ number of ruffles  $N_r $N_a  \equiv $ number or ruffling of host  cells ($\geq 1 $ ruffles) with $\geq 1$ bacteria attached  $t_{\mathrm{max}} $N_x  \equiv $ total incubation time number of host cells with $\geq 1$ bacteria invaded  \subsection{Fractions} $N_r \equiv $ number of host cells with $\geq 1$ ruffles  $\tilde{N}_{R, \rm max} \equiv$ maximum number of ruffles per cell  $\tilde{N}_{B, \rm max} \equiv$ maximum number of bacteria per ruffle  $t_{\mathrm{max}} \equiv $ total invasion time  \subsection{Fractions}  $m \equiv $ multiplicity of infection (MOI) $ = \frac{N_B(t=0)}{N}$