Volume 13, Number 12—December 2007
Dispatch
Escherichia coli O157:H7 in Feral Swine near Spinach Fields and Cattle, Central California Coast1
Michele T. Jay*
, Michael Cooley‡, Diana Carychao‡, Gerald W. Wiscomb§, Richard A. Sweitzer¶, Leta Crawford-Miksza*, Jeff A. Farrar#, David K. Lau**, Janice O’Connell*, Anne Millington#, Roderick V. Asmundson**, Edward R. Atwill, and Robert E. Mandrell‡
, Michael Cooley‡, Diana Carychao‡, Gerald W. Wiscomb§, Richard A. Sweitzer¶, Leta Crawford-Miksza*, Jeff A. Farrar#, David K. Lau**, Janice O’Connell*, Anne Millington#, Roderick V. Asmundson**, Edward R. Atwill, and Robert E. Mandrell‡Table 2
Unique alphanumeric MLVA types of Escherichia coli O157:H7 isolated from environmental samples collected at ranch A and an upstream watershed, California, September–November 2006*
| Sample type | No. samples | No. isolates | MLVA type |
|---|---|---|---|
| Reference (human stool, bagged spinach) | NA | NA | E |
| Cattle feces | 26 | 34 | A, C, E, F, I, J, L, M, P, Q, R, S, T, W, X, Z |
| Feral swine feces | 11 | 14 | A, B, C, E, L, O, P, X, 5, 6 |
| Feral swine colonic feces (necropsy) | 2 | 10 | A, C, D, G, H, K, L, U, V, Y |
| Sediment (river) | 2 | 8 | A, C, L, M, N, W, 3 |
| Soil (cattle pasture) | 1 | 1 | A |
| Surface water | 3 | 6 | A, C, L, P, 4 |
| Surface water Moore swab† | 2 | 3 | 1, 2 |
*MLVA, multilocus variable number tandem repeat analysis; NA, not applicable. Samples indistinguishable from the major spinach-related outbreak strain by pulsed-field gel electrophoresis (XbaI-BlnI PulseNet profile EXHX01.0124-EXHA26.0015) are shown in boldface.
†Isolates collected from surface water (river) ≈32 km upstream of ranch A.
