Cell permeability assay of S. Typhi STH2370 WT, and S. Typhimurium 14028s WT and derivatives, through H-T29 human cell line monolayers. The arrow indicates the time at which gentamicin was added. The experiments were performed in three full biological replicates, each time in technical triplicate. The values are expressed as the mean ± standard deviation of three independent experiments. *p < 0.005 (Student’s-test).