Table 1.

Association of PAIs and virulence genes with SPTs related to outbreak (SPTs A and B), severe disease (SPTs A, B, and C), and LEE

PAI	Gene	Prevalence (%)a
		Association with SPTs related to outbreak		Association with SPTs related to severe disease		Association with LEE
		In SPTs A and B (n = 34)	In SPTs C, D and E (n = 64)	In STEC SPTs A, B, and C (n = 56)	In STEC in SPTs D and E (n = 42)	In eae-positive STEC (n = 54)	In eae-negative STEC (n = 44)
OI-122		55.82*	17.18*	46.43†	9.52†	55.56‡	0‡
	pagC	70.59	46.88	69.64 †	35.71†	64.81‡	38.64‡
	sen	100.00*	31.25*	76.79 †	26.45†	100.00‡	2.27‡
	efa-1	82.35*	31.25*	66.07†	30.95†	88.89‡	6.82‡
	efa-2	82.35*	31.25*	66.07†	26.45†	88.89‡	2.27‡
	nleB	100.00*	31.25*	76.79†	26.45†	100.00‡	2.27‡
OI-43/48		32.35	12.50	26.79	14.28	37.03‡	2.27‡
	terC	76.47*	35.94*	62.50†	33.33†	81.48‡	11.36‡
	ureC	76.47*	31.25*	62.50†	26.45†	81.48‡	4.54‡
	iha	64.70	70.31	64.29	73.80	57.41‡	84.09‡
	aidA-1	38.23	32.81	39.28	28.57	65.91‡	18.18‡
OI-57		82.35*	21.86*	60.71†	19.05†	75.93‡	2.27‡
	nleG2-3	97.06*	31.25*	73.21†	28.57†	94.44‡	6.82‡
	nleG5-2	82.35*	21.88*	60.71†	19.04†	85.19‡	2.27‡
	nleG6-2	97.18*	28.13*	66.07†	28.57†	75.93‡	4.56‡
HPI		17.65	25.00	17.86	28.57	25.92	18.18
	fyuA	17.65	23.44	16.07	28.57	25.92	18.18
	irp2	17.65	23.44	16.07	28.57	25.92	18.18

^a*, Statistically significant difference between SPTs A and B compared to SPTs C, D, and E; †, statistically significant difference between SPTs A, B, and C compared to SPTs D and E; ‡, statistically significant difference between eae-positive and eae-negative STEC. A P value of <0.01 was considered statistically significant.