TABLE 1.

Characteristics of O157:H7 and non-O157 STEC isolates used in the study

Isolate	Serotype	stx genea	Presence (+) or absence (−) of:		Source	Yr
			eae gene	hlyA gene
CVM65	O157:H7	1, 2	+	+	Cattle	1991
CVM68	O157:H7	1, 2	+	+	Cattle	1991
CVM990	O157:H7	1, 2	+	+	Cattle	1991
CVM996	O157:H7	1, 2	+	+	Cattle	1991
CVM1001	O157:H7	1, 2	+	+	Cattle	1991
CVM69	O157:H7	1, 2	+	+	Cattle	1992
CVM73	O157:H7	1, 2	+	+	Cattle	1992
CVM998	O157:H7	1, 2	+	+	Cattle	1992
CVM1002	O157:H7	1, 2	+	+	Cattle	1992
CVM1000	O157:H7	1, 2	+	+	Cattle	1992
CVM1010	O157:H7	1, 2	+	+	Cattle	1992
CVM35	O157:H7	1, 2	+	+	Cattle	1993
CVM37	O157:H7	2	+	+	Cattle	1993
CVM44	O157:H7	1, 2	+	+	Cattle	1993
CVM978	O157:H7	2	+	+	Cattle	1993
CVM981	O157:H7	1, 2	+	+	Cattle	1993
CVM988	O157:H7	1, 2	+	+	Cattle	1993
CVM1006	O157:H7	2	+	+	Cattle	1993
CVM1007	O157:H7	1, 2	+	+	Cattle	1993
CVM79	O157:H7	1, 2	+	+	Ground beef	1988
CVM33	O157:H7	1, 2	+	+	Ground beef	1993
CVM1004	O157:H7	1, 2	+	+	Ground beef	1993
CVM46	O157:H7	1, 2	+	+	Ground beef	1994
CVM47	O157:H7	1, 2	+	+	Ground beef	1994
CVM1009	O157:H7	1, 2	+	+	Ground beef	1994
CVM48	O157:H7	1, 2	+	+	Ground beef	1995
CVM90	O157:H7	1, 2	+	+	Human	1983
CVM51	O157:H7	1, 2	+	+	Human	1992
CVM1008	O157:H7	1, 2	+	+	Human	1992
CVM1871	O26:H11	1	+	+	Cattle	1991
CVM1888	O26:H11	1	+	+	Cattle	1993
CVM1875	O103:H2	1, 2	+	+	Cattle	1993
CVM1876	O103:H2	1	+	+	Cattle	1993
CVM1877	O111:H8	1	+	+	Cattle	1993
CVM1884	O111:NM	1	+	+	Cattle	1993
CVM1878	O111:H11	1, 2	+	+	Cattle	1994
CVM1879	O111:H11	1	+	+	Cattle	1994
CVM1880	O111:NM	1, 2	+	+	Cattle	1994
CVM1881	O118:H16	1	+	+	Cattle	1993
CVM1887	O126:H8	1	+	−	Cattle	1991
CVM1874	O91:H21	1, 2	−	+	Cattle	1993
CVM1889	O45:H2	1	+	+	Cattle	1992
CVM1873	O88:H49	1,	+	+	Ground beef	1994
CVM1872	O46:H38	1, 2	−	+	Ground beef	1991
CVM1870	O22:H8	2	−	+	Ground beef	1993
CVM1882	O125:NM	1	+	+	Human	1990
CVM1883	O113:K75:H21	2	+	+	Human	1988
CVM1885	O103:H2	1, 2	+	+	Human	1987
CVM1890	O5:NM	1	+	+	Human	1996
CVM1891	Orough:H9	2	+	+	Human	1996

^a1, stx-1 positive; 2, stx-2 positive.