TABLE 1 .

Invasion of intestinal epithelial cells in vivo and ex vivo by SK3842

Strain	% of invasiona			LD50
	In vivob		Ex vivoc
	1 h	3 h
SK3842	7.8 ± 3.6	13.4 ± 2.7	17.6 ± 8.6	1.6 × 108
MG1655	0.001	0.002	0.004	2.1 × 108

^a Percentage of bacteria in the inoculum that invaded intestinal mucosal cells.

^b Invasion assay done as per the ligated intestinal loop assay described in Materials and Methods.

^c Invasion assay done as per ex vivo intestinal invasion assay described in Materials and Methods.