Table 4. Resistance profiles of E. coli isolated on MacConkey with and without 10 mg/l ampicillin (AMP) and their counts.
| No AMP in plate | AMP in plate | |||
|---|---|---|---|---|
| Resistance profile1 | ANT, n (N = 26) | CON, n (N = 33) | ANT, n (N = 26) | CON, n (N = 33) |
| Susceptible to all antimicrobials tested | 11 | 12 | - | - |
| AMP-CIP | - | 1 | 2 | 1 |
| AMP-CIP-CS | - | - | - | 1 |
| AMP-CIP-NAL-STR-SU-TM-KAN | - | - | 1 | - |
| AMP-CIP-STR | - | 1 | 3 | 4 |
| AMP-CIP-STR-SU-TM | 1 | - | - | 1 |
| AMP-CIP-STR-TET-SU-TM | - | - | 1 | 1 |
| AMP-STR | 1 | - | - | - |
| AMP-STR-SU-TM | - | - | 1 | 1 |
| AMP-STR-TET | - | - | 2 | 2 |
| AMP-STR-TET-SU | - | 1 | 1 | - |
| AMP-STR-TET-SU-TM | 5 | 8 | 10 | 15 |
| AMP-STR-TET-SU-TM-CM | 1 | - | - | 1 |
| AMP-STR-TET-SU-TM-KAN | 1 | - | 1 | - |
| AMP-TET | - | - | 1 | - |
| AMP-TET-SU | - | - | 1 | - |
| AMP-TET-SU-TM | - | - | - | 1 |
| GEN-STR | - | 1 | - | - |
| STR-KAN | 1 | - | - | - |
| STR-TET-SU-TM | 4 | 6 | - | - |
| TET | 1 | - | - | - |
| TET-KAN | - | 2 | - | - |
| TM | - | 1 | - | - |
Pigs in ANT group were treated with amoxicillin during the first day of life while CON pigs were not.
1 AMP = ampicillin, CIP = ciprofloxacin, NAL = nalidixic acid, GEN = gentamicin, STR = streptomycin, FF = florfenicol, TET = tetracycline, CS = colistin, SU = sulfamethoxazole, TM = trimethoprim, CM = chloramphenicol, KAN = kanamycin, CTX = cefotaxime, CAZ = ceftazidime.