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.