TABLE 2.
EPMs of E. coli isolatesa
| E. coli isolate and description (EPA study identification no.) | n | EPM (μm cm V−1 s−1)
|
|
|---|---|---|---|
| Mean | SD | ||
| O157:H7 | |||
| Dairy isolate USDA N009-6-1, WI (EPA 1) | 4 | −0.28 | 0.08 |
| Dairy isolate USDA N6059-7-2, MO (EPA 2) | 4 | −0.42 | 0.04 |
| Dairy isolate USDA 6104-5-9, FL (EPA 3) | 4 | −0.46 | 0.05 |
| Dairy isolate USDA N6021-5-1, ID (EPA 4) | 4 | −0.44 | 0.13 |
| Dairy isolate USDA N6049-26-1, IL (EPA 5) | 4 | −0.40 | 0.07 |
| Dairy isolate USDA N6001-8-10, WA (EPA 6) | 4 | −0.22 | 0.11 |
| Dairy isolate USDA N6114-7-2, TX (EPA 7) | 4 | −0.32 | 0.08 |
| Wild type | |||
| Isolate from water main break, Louisville, Ky. (EPA 8) | 4 | −1.40 | 0.05 |
| Isolate from Kenton County, Ky. (EPA 9) | 4 | −1.44 | 0.05 |
| Isolate from sewage sludge, Maryland (EPA 174) | 4 | −0.82 | 0.08 |
| Isolate from sewage sludge, Maryland (EPA 175) | 4 | −1.94 | 0.22 |
| Dairy manure, Kentucky | 2 | −1.30 | 0.00 |
a
Isolates were suspended in 9.15 mM KH2PO4-buffered deionized water (pH 6.45 to 6.55; ionic strength, 0.007 M). USDA, U.S. Department of Agriculture.