TABLE 4.

Prevalence of virotypes according to H30 subclone status among 128 archival ST131 Escherichia coli isolates (1968 to 2011)

Virotype	No. (column %) of isolates with indicated virotype				P valuea
	Total (n = 128)	Non-H30 (n = 62)	H30, (non-Rx) (n = 17)	H30-Rx (n = 49)	Non-H30 vs H30 (non-Rx)	Non-H30 vs H30-Rx	H30 (non-Rx) vs H30-Rx
Ab	40 (31)	7 (11)	0 (0)	33 (67)		<0.001	<0.001
Bc	1 (1)	0 (0)	0 (0)	1 (1)
Cd	22 (17)	0 (0)	13 (77)	9 (18)	<0.001	<0.001	<0.001
D1 to D5e	32 (25)	32 (52)	0 (0)	0 (0)	<0.001	<0.001
Ef	1 (1)	0 (0)	1 (<1)	0 (0)
Other	32 (25)	23 (37)	3 (18)	6 (12)		0.004

^aP values, by Fisher's (2-tailed) exact test, are shown where P < 0.05.

^bVirotype A: positive or negative for sat, positive for afa and draBC, positive for afa operon FM955459, negative for ibeA, ironN, papGII, papGIII, cnf1, hlyA, cdtB, and neuCK1.

^cVirotype B: positive for ironN, positive or negative for sat, negative for all of the other genes listed.

^dVirotype C: positive for sat, negative for all of the other genes listed.

^eVirotype D: positive for ibeA, positive or negative for ironN, positive or negative for sat, positive or negative for afa and draBC, positive or negative for afa operon FM955459, positive or negative for papGIII, positive or negative for cnf1, positive or negative for hlyA, positive or negative for cdtB, positive or negative for neuCK1, negative for papGII. D subtypes (number of isolates): D1 (5), D2 (5), D3 (18), D4 (4), and D5 (0).

^fVirotype E: positive for sat, positive for papGII, positive for cnf1, positive for hlyA, negative for all of the other genes listed.