Table 2.
Numbers of super-shedder (SS)v and low-shedder (LS)w isolates from both samplings sharing restriction endonuclease digestion pattern clusters (REPC, 90% or greater similarity) and description of most prevalent REPC, REPC A by feedlot and pen
| |
All REPCx |
REPC A only |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Feedlot | Pen | No.SS | No.LS | No. SS sharing REPC with LS (%) | No. SS in SS only REPC (%) | No. isolates | No, SS fecal | No. SS hide | No. LS fecal |
| A |
1* |
3 |
16 |
1 (33) |
2 (67) |
15 |
1 |
1 |
13 |
| |
2* |
36 |
47 |
12 (33) |
24(67) |
41 |
12 |
6 |
23y |
| |
3 |
12 |
100 |
11(92) |
1(8) |
5 |
4 |
1 |
0 |
| |
4 |
19 |
56 |
0 (0) |
19 (100) |
11 |
9 |
2 |
0 |
| |
5 |
7 |
27 |
0(0) |
7 (100) |
4 |
4 |
0 |
0 |
| |
6 |
3 |
2 |
0(0) |
3(100) |
1 |
1 |
0 |
0 |
| |
7 |
0 |
1 |
NAz |
NA |
2 |
0 |
0 |
2 |
| B |
1 |
27 |
76 |
4(15) |
23 (85) |
12 |
12y |
0 |
0 |
| |
2* |
44 |
116 |
9 (20) |
35 (80) |
120 |
9 |
10 |
101y |
| |
3* |
10 |
23 |
1(10) |
9 (90) |
19 |
1 |
0 |
18 |
| |
4 |
1 |
31 |
0 (0) |
1(100) |
5 |
0 |
0 |
5 |
| Total | 162 | 496 | 38 (23) | 124 (77) | 235 | 53 | 20 | 162 | |
Pens where SS and LS isolates belonged to REPC A are marked by *, percentages are bracketed.
vSuper-shedder, shedding at least 104 CFU E. coli O157:H7/g feces.
wLow-shedder, shedding < 104 CFU E. coli O157:H7/g feces.
xAll REPC, number of super-shedders based on fecal isolates, super-shedder fecal and hide swab isolates included in REPC shared with low-shedders.
yIncludes isolates from the second sampling.
zNA, not applicable, no super-shedders in pen.