TABLE 2.

Adhesion and invasion characteristics of L. monocytogenes wild-type and mutant strains^a

Strain	Adhesion		Invasion
	Henle-407	Caco-2	Henle-407	Caco-2
Wild type	1.00	1.00	1.00	1.00
ΔsigB	0.81 ± 0.17	0.68 ± 0.20	0.54 ± 0.11***b	0.23 ± 0.10***
ΔP2prfA	0.95 ± 0.18	1.28 ± 0.33	1.08 ± 0.11	1.07 ± 0.11
ΔinlA	NDc	ND	0.52 ± 0.20**	0.21 ± 0.10**
ΔinlB	ND	ND	0.79 ± 0.27	0.93 ± 0.35

^aResults are reported as ratios of mutant strain numbers relative to wild-type strain numbers, with wild-type numbers arbitrarily set to 1. The means and standard deviations from at least three independent experiments are shown for each strain.

^bP values (*, <0.05; **, <0.01; ***, <0.001) for comparison between respective mutant strain and wild-type invasion by one-sample t test are indicated by asterisks.

^cND, not determined.