Table 5.

Interaction of cell treatments and time on ε-toxin gene expression (P<0.05)

Time (h)	0		2		5		SEM	P-value
Mean gene expression	2.720a	2.703a	3.623b	2.527a	3.890b	2.777a	0.15	<0.001
Bacterial treatments	Contact with Caco-2	Non-contact with caco-2	Contact with Caco-2	Non-contact with caco-2	Contact with Caco-2	Non-contact with caco-2

The means with dissimilar letters have significant differences based on Duncan’s multiple range tests and the means with the same letter are not significantly different. SEM: Standard error mean