Table 2.

E. coli virulence factors detected in case and control piglets (only isolates from herd-pools with positive results for both toxin(s) and adhesin(s) were individually tested)

Piglets tested for EAST-1 and STb genes (n = 45)	Case piglets (n = 29)	Control piglets (n = 16)	P-value*
EAST-1	6 (21%)	1 (6%)	0.4
EAST-1 + STb	10 (34%)	2 (13%)	0.2
Toxin detected	16 (55%)	3 (19%)	0.03
Piglets tested for F41 and AIDA-1 genes (n = 19)	Case piglets (n = 16)	Control piglets (n = 3)
AIDA-1#	10 (63%)	2 (67%)	1
F41	0 (0%)	0 (0%)	1

*Two-sided Fisher’s exact test. ^#All piglets that were positive for AIDA-1 were positive for both EAST-1 and STb