TABLE 1.

Distribution of subtypes among lots

Lota	Subtype(s)b recovered within cluster:					Nonclustered subtype
	B1	B (not B1)	C	A
A1-1	1d, 1g, 4a	23b				43
A1-2		14a, 14b, 23b
A1-3		23a, 23b	39c
A2-1		20
A2-2	4c
A2-3	4c		33
A2-4	1d	23b, 27
B1-1
B1-2		25
B1-3	1d, 8a, 8b, 8e
B1-4	1d, 7b, 8b		31
B2-1	5, 6a, 6d		29a
B2-2	1b, 1c, 6c, 6d, 8c	21	29a, 38
B2-3	6b, 6d	10, 19, 26	29a
B2-4	6d	12, 15	30a			44
C1-1	1d, 1e, 1f, 4b, 8d, 8e	11		46b
C1-2			33, 41	45, 46a, 46b, 46c
C1-3	1d, 1f, 7a			46b, 47a
C1-4	1d, 4a	16	35	46b, 47b, 47c
C2-1	8c			46a, 46b, 46c, 47b
C2-2	3	9a, 13b, 22	37a, 37b
C2-3	1a, 3	13b	29b, 39c
C2-4		9b, 13a, 24	29c, 28, 34, 36
			39a, 39b, 39c
D1-1	1d		32
D1-2	1b		32
D1-3
D1-4		17	42
D2-1			39c
D2-2	1f, 2, 8c	18	33, 40
D2-3	1f, 8c		30b, 31

^aFor lot designations, the letter indicates the plant, the first number indicates the trip, and the last number indicates the lot. 

^bThe subtypes of E. coli O157 recovered from samples within each lot are indicated. Subtypes are grouped according to overall clusters (see Fig. 1).