TABLE 1.

Oligonucleotide probing of plaques on an MC1061 bacterial lawn infected with culture filtrates from various STEC strains^a

STEC strain	Serotype	Phage type	Phage titer/ml of culture filtrate	No. of plaques probed	No. of plaques hybridizing to:
					Stx1 probe	Stx2 probe
CF16	NDc	ND	8.3 × 102	332	0	0
E45040			1.2 × 106	121	0	121
E45040 (UV)b	O111:H−	ND	6.7 × 108	670	0	670
E83819			1.7 × 106	171	171	0
E83819 (UV)	O157:H7	14	1.6 × 108	160	160	0
E85539	O157:H7	4	1.4 × 106	175	0	175
E86654	O157:H7	4	7.1 × 104	126	121	5
PS14			1.5 × 106	510	0	510
PS14 (UV)	O157H7	ND	2.4 × 107	240	0	240

^aPlaques were probed with oligonucleotides specific to Stx1 and Stx2 toxin genes. Data for serotypes and phage types were obtained from the CPHL.

^b(UV), culture was subjected to UV irradiation to induce phage production.

^cND, not determined.