Table 1.
Prevalence of E. coli resistance and resistance genes in multidrug-resistant E. coli isolated from groups of pigs.
| Antibiotic Agent | Resistance gene | No. (%) of E. coli isolated from | ||
|---|---|---|---|---|
|
| ||||
| Piglets (n=34) | Sows (n=22) | Total (n=56) | ||
| Ampicillin | resistance | 31 (91) | 10 (45) | 41 (73) |
|
| ||||
| blaTEM-1 | 32 (94) | 6 (27) | 38 (68) | |
|
| ||||
| Streptomycin | resistance | 32 (94) | 18 (82) | 50 (89) |
|
| ||||
| aadA1 | 26 (76) | 19 (50) | 45 (80) | |
| strA/B | 12 (35) | 6 (27) | 18 (32) | |
|
| ||||
| Tetracycline | resistance | 28 (82) | 12 (54) | 40 (71) |
|
| ||||
| tetA | 22 (65) | 8 (36) | 30 (54) | |
| tetB | 1 (3) | 7 (32) | 8 (14) | |
| tetC | 7 (20) | 1 (4) | 8 (14) | |
|
| ||||
| Trimethoprim | resistance | 34 (100) | 22 (100) | 56 (100) |
|
| ||||
| dfrA1 | 29 (85) | 20 (91) | 49 (87) | |
| dfrA5 | 17 (50) | 2 (9) | 19 (34) | |
| dfrA7 | 11 (32) | 7 (32) | 18 (32) | |
| dfrA12 | 16 (47) | 19 (86) | 35 (62.5) | |
|
| ||||
| Sulfamethoxazole | resistance | 34 (100) | 20 (91) | 54 (96) |
|
| ||||
| sul1 | 25 (73) | 11 (50) | 36 (64) | |
| sul2 | 18 (53) | 7 (32) | 25 (45) | |
| sul3 | 17 (50) | 7 (32) | 24 (43) | |
|
| ||||
| Ciprofloxacin | resistance | 4 (12) | 0 | 4 (7) |
|
| ||||
| qnrS | 3 (9) | 0 | 3 (5) | |
The presence of the following genes was not detected in the tested set: resistance to β-lactams: blaSHV-1, blaCTX-M and ampC, tetracycline tetD; gentamicin aac(3)IV, trimethoprim dfrA17, phenicols: floR, cmlA, cat1; quinolones qnrA.