Table 7.
Antibiotic resistances from the disk diffusion method of some of the isolated E. coli strains from the farm near Karnobat (F1.1–W2.4).
| Drug Class | Antibiotic/Strain | F1.1 | F2.1 | F2.2 | F3.1 | F4.1 | F4.2 | F5.1 | F6.1 | F6.2 | W1.1 | W1.2 | W2.1 | W2.2 | W2.3 | W2.4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tetracyclines | Tetracycline | R | R | R | R | R | R | R | R | R | R | I | S | R | R | R |
| Doxycycline hydrochloride | R | R | R | R | R | R | R | R | R | R | I | R | S | R | R | |
| Macrolides | Erythromycin | I | I | I | R | I | I | I | R | R | I | I | I | I | I | I |
| Cephalosporins | Cefamandole | S | S | S | S | S | S | I | S | S | S | S | S | S | S | S |
| Fluoroquinolones | Nalidixic acid | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Pefloxacin | S | S | S | S | S | S | S | S | S | S | S | S | R | S | S | |
| Ciprofloxacin | S | S | S | S | S | S | S | S | I | S | S | S | S | S | S | |
| Penicillins | Ampicillin | S | R | R | S | R | R | R | R | R | R | S | R | S | R | S |
| Amoxicillin | S | R | R | S | R | R | R | R | R | R | S | R | S | R | S | |
| Amoxicillin/clavulanic acid | R | S | R | S | R | R | R | R | R | S | S | S | S | S | S | |
| Carbenicillin | I | I | R | S | S | S | I | I | I | S | S | I | S | S | S | |
| Carbapenems | Meropenem | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Aminoglycosides | Streptomycin | R | R | R | R | R | R | R | S | I | S | S | R | I | I | R |
| Other agents | Chloramphenicol | R | R | R | R | S | S | R | R | R | R | R | R | R | R | S |
| Trimethoprim/sulfamethoxazole | S | R | S | S | R | S | R | S | S | S | R | S | S | S | S |
Legend: R, Resistant; I, Intermediate; S, Sensitive; F, Feces; W, Wastewater. The first number is the number of the sample, and the second number is the number of the isolate.