FIG. 2.

Percentage of inoculum surviving a HeLa cell gentamicin protection assay. After 3 h of infection, cells were washed and incubated for 1 h in the presence of 100 μg ml⁻¹ of gentamicin. The percent recovered inoculum was calculated by dilution plate counting and the formula [CFU recovered/CFU (inoculated) × 100]. Bars represent geometric means for each strain, tested in triplicate in three independent experiments. Error bars represent standard deviation. Statistical significance was determined by Student's t test (***, P < 0.001).