TABLE 1.

E. coli genotypes carried into chilled carcasses and ground beef that were also recovered at various stages of beef production

RAPD type	No. of isolatesa
	P		F		H	PC	CC	GB	Total
	1 mo	5 mo	1 mo	5 mo
2					10			1	11
9	42		3	80	47	32	3	20	227
12	2	18	24	5	6	4		1	60
14	1				4	4		2	11
26				1		2		1	4
29	27	9	1	2	1	1		1	42
31	13	1		10	16	9	1		50
34	5	1			5	5		14	30
35	2	1	2	6	5	2	4		22
36					1			2	3
39	5	1		21	17	4		3	51
41	1	1		2	5	1		14	24
51					1			1	2
53	1			10	4	3		2	20
62		3	2	5		1		1	12
63	3	2			1	1		1	8
67		26	26				1		53
78					2	1		1	4
107		1		1	1			2	5
109	1	2			9			8	20

^aSample sources: P, pasture; F, feedlot; H, hide; PC, prechilled carcasses; CC, chilled carcasses; GB, ground beef.