Table 5.
Numbers and profiles of antibiotic resistance (AMR) of E. coli O157:H7 isolated from feces collected in Alberta, Canada in 2007 and number of isolates susceptible to all antibiotics (SUS) by feedlot and pen for super-shedders (SS)x and low-shedders (LS)y of E. coli O157:H7
| Feedlot | Pen | No. of resistant SS isolates (%) | Resistance toz | No. of resistant LS isolates (%) | Resistance to | Total No. SUS |
|---|---|---|---|---|---|---|
| A |
1 |
0 (0) |
ND |
2 (12) |
tetracycline, sulfasoxazole, neomycin, streptomycin , tetracycline |
19 |
| |
2 |
1 (3) |
ampicillin, sulfasoxazole, streptomycin, tetracycline |
2 (6) |
tetracycline, sulfasoxazole, streptomycin, sulfamethoxazole/trimethroprim |
71 |
| |
3 |
0 (0) |
ND |
1(4) |
tetracycline |
35 |
| |
4 |
2 (11) |
ceftazidime, streptomycin, sulfasoxazole, sulfamethoxazole/trimethro-prim |
2(9) |
tetracycline, tetracycline, streptomycin |
41 |
| |
5 |
0 (0) |
ND |
1 (3) |
sulfasoxazole, streptomycin, tetracycline |
46 |
| |
6 |
0 (0) |
ND |
1(3) |
tetracycline |
34 |
| |
7 |
0 (0) |
ND |
0 (0) |
ND |
1 |
| B |
1 |
0 (0) |
ND |
3 (6) |
tetracycline |
78 |
| |
2 |
0 (0) |
ND |
0 (0) |
ND |
94 |
| |
3 |
0 (0) |
ND |
1(6) |
tetracycline |
26 |
| |
4 |
0 (0) |
ND |
1(9) |
tetracyline |
12 |
| Total | 3 (2) | 14 (5) | 457 |
xSuper-shedder, shedding at least 104 CFU E. coli O157:H7/g feces.
yLow-shedder, shedding < 104 CFU E. coli O157:H7/g feces.
zAntibiotic resistance: No resistance to enrofloxacin, amoxicillin/clauvanate or cetiofur was detected.