TABLE 3.

PFGE patterns of E. coli O157:H7 isolates according to source

PFGE pattern	No. (%) of isolates
	Patient	Water	Soil from dry well	Septic tank
1	76 (65.0)	12 (63.1)	0	1 (25)
1a	31 (26.5)	1 (5.3)	0	3 (75)
1b	2 (1.7)	0	0	0
1c	1 (0.9)	0	0	0
1e	0	6 (31.6)	0	0
1f	0	0	10 (100)	0
1g	2 (1.7)	0	0	0
1h	1 (0.9)	0	0	0
2	1 (0.9)	0	0	0
4	3 (2.6)	0	0	0
Total	117	19	10	4