TABLE 1.

Relationship between Stx2 toxin titers for E. coli O157:H7 strains (in vitro) and the symptoms and survival of piglets infected with E. coli

Group	Strain	Reference or source	Stx2 titera	Piglets
				Mean survival time (days)b	% with CNS disease	% with brain infarctions	n
Control	EDL933	45	161	4.3	100	90	10
Human	3234-86	39	32	6.4	80	100	5
	B8763	41	25	5.2	100	80	5
	A7785	45	20	8.0	20	20	5
	C9490	3	32	5.2	60	20	5
	B1189	51	102	3.8	100	80	5
	C509	48	102	3.4	100	100	5
	C6183	T. J. Barrett	25	5.2	80	60	5
	C8779	3	32	4.0	100	80	5
	C7927	7	20	6.0	80	60	5
	C4193	58	10	7.2	40	40	5
Bovine	2890	4	64	5.2	80	80	5
	2893	4	<2	8.0	0	20	5
	2903	4	25	8.0	0	0	5
	2909	4	16	6.6	40	20	5
	3032	4	6	8.0	0	20	5
	2922	4	<2	8.0	0	0	5
	2918	4	<2	8.0	0	0	5
	2939	4	40	5.2	100	100	5
	2891	4	10	6.4	40	20	5
	2977	4	51	5.4	80	80	5

^aRelative concentration of Stx2 (in arbitrary units) as measured with a verotoxigenic E. coli reverse passive latex agglutination assay.

^bUp to 8 days postinoculation.