Table 3.
Antibiotic resistance test of 16 Escherichia coli isolates collected from 8 birds (two isolates per bird)
| Antibiotics | Isolates | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L1/III-B-2-ovary1 | L1/III-B-2-ovary2 | L1/III-B-3-ovary | L1/III-B-3-oviduct | L1/III-B-4-oviduct1 | L1/III-B-4-oviduct2 | L2/IV-B-1-ovary | L2/IV-B-1-liver | L1/V-A-4-oviduct | L1/V-A-4-ovary | L2/V-B-5-ovary | L2/V-B-5-heart | L1/VI-B-1-ovary | L1/VI-B-1-oviduct | L2/VI-B-2-ovary | L2/VI-B-2-oviduct | |
| Ampicillin | I | I | I | R | R | S | S | S | I | I | S | S | I | I | I | I |
| Amoxycillin | I | R | I | R | R | I | S | I | I | I | I | I | I | I | R | I |
| Ceftiofur | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Colistin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Doxycycline | I | I | S | R | R | S | S | S | S | S | S | R | S | S | I | S |
| Enrofloxacin | S | S | S | S | S | S | S | S | S | S | S | I | S | S | S | S |
| Gentamicin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Neomycin | S | S | S | S | S | S | S | S | S | S | S | R | S | S | S | S |
| Oxolinic acid | S | S | S | S | S | S | S | S | S | R | R | R | R | S | S | S |
| Tetracycline | S | S | S | R | R | S | S | S | S | S | S | I | S | S | S | S |
| Tylosin | R | R | R | R | R | R | R | R | R | R | R | R | R | R | R | R |
| Spectinomycin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Sulphamethoxazole + trimethoprim | S | S | S | R | R | S | S | S | S | S | S | S | S | S | S | S |
Each isolate ID is designated with letter “L” along with the number of layer flock and rearing farm – A (sampling at the peak of production) or B (sampling at the end of production) – number of sampled bird – organ of isolation – isolate number (in case when two isolates were collected from the same organ). Antibiotic resistance pattern of two isolates from the same bird are in bold letter and highlighted if they showed different sensitivity to antimicrobials used. S: sensitive, I intermediate, R: resistant