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Volume 12, Number 5—May 2006

Dispatch

Shiga-toxigenic Escherichia coli O157 in Agricultural Fair Livestock, United States

James E. Keen*Comments to Author , Thomas E. Wittum†, John R. Dunn‡, James L. Bono*, and Lisa M. Durso*
Author affiliations: *United States Department of Agriculture, Clay Center, Nebraska, USA; †Ohio State University, Columbus, Ohio, USA; ‡Louisiana State University, Baton Rouge, Louisiana, USA

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Table 2

Gene profiles of Escherichia coli O157:H7 from livestock fecal and pest fly samples collected at 32 state and county fairs by source species, 2002*

Sample
No. samples collected
No. (%) E. coli O157:H7-positive samples
Gene profile, no. isolates (%)
stx1 only
stx2 only
Both stx1 and stx2
Neither stx1 nor stx2
eae-positive
Beef cattle 1,163 160 (13.8) 0 99 (61.9) 52 (32.5) 9 (5.6) 158 (98.8)†
Dairy cattle 244 10 (4.1) 1 (10.0) 8 (80.0) 1 (10.0) 0 10 (100)
Pigs 1,102 22 (2.0) 0 6 (27.3)‡ 7 (31.8) 9 (40.9) 15 (68.2)§
Sheep 251 11 (4.4) 0 5 (45.5) 6 (54.6) 0 11 (100)
Goats 113 2 (1.9) 0 2 (100.0) 0 0 2 (100.0)
Other livestock 46 0 NA NA NA NA NA
Fly pools 154 9 (5.8) 0 6 (66.7) 2 (22.2) 1 (11.1) 9 (100.0)
All sources 3,073 214 (6.9) 1 (0.5) 126 (58.9) 68 (31.8) 19 (8.9) 205 (95.8)

*Identified by polymerase chain reaction. stx, Shiga toxin; eae, intimin; NA, not available.
†Both beef cattle eae-negative isolates were also stx-negative.
‡Includes 1 eae-negative swine isolate.
§Includes all 13 stx-positive swine isolates and 2 stx-negative isolates.

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