Table 2. Mean size and spatial distribution of bacteria-occupied vacuoles.

Bacterial Strain	Mean Vacuole Size (+/- SEM) µm		% Bacteria-Occupied Vacuoles which are Perinuclear [Mean (+/- SEM)]
	Non-Acidic Vacuoles	Acidic Vacuoles	Non-Acidic Vacuoles	Acidic Vacuoles
exsA mutant	0.99 +/- 0.06	1.15 +/- 0.04†	10.9 +/- 1.5	34.3 +/- 3.7†
popB mutant	1.07 +/- 0.06††	1.18 +/- 0.05	12.8 +/- 2.0	24.4 +/- 5.4
PAO1 wild-type	0.89 +/- 0.07	1.10 +/- 0.05†	19.2 +/- 4.8	32.9 +/- 5.3

Values compared using ANOVA (p = 0.004) and pairwise using Welch’s corrected t-Test

^† Significant difference from non-acidic vacuoles of the same strain (p < 0.05, Welch’s corrected t-Test)

^{† †} Significant difference from non-acidic vacuoles of PAO1 (p < 0.05, Welch’s corrected t-Test)