TABLE 5.
Characteristics of class 1 integron-carrying multidrug-resistant S. enterica strains isolated from poultry meat and faecal samples (n = 64).
| Amplicon size in class 1 integron-PCR (bp) | No. (%) | Resistance genes | Antibiotic resistance profile† | ESBL | Serogroup (no. of isolates) | Serotype‡ | Origin and no. of isolates | |
|---|---|---|---|---|---|---|---|---|
| Poultry meat | Faecal samples | |||||||
| 700 | 2 (3.1) | sul1, blaTEM-1 | SUL, NA, TE, TIM, C, SXT, SAM | – | B (1), C2 (1) | N/A | 2 | – |
| 700 | 2 (3.1) | sul1, blaTEM-1, blaSHV-1 | SUL, NA, TE, AM, S, TIM, SXT, CTX, ATM, CAZ | + | B (2) | N/A | 2 | – |
| 950–1200 | 1 (1.6) | sul1 | SUL, NA, TE, S, TIM, SXT | – | C1 (1) | N/A | 1 | – |
| 1000 | 10 (15.6) | sul1, sul2, blaTEM-1 | SUL, NA, TE AM | – | C1 (9), C2 (1) | N/A | 8 | 2 |
| 1100 | 2 (3.1) | sul1 | SUL, NA, TE S, TIM, SXT | – | B (2) | N/A | 1 | 1 |
| 1100–1550 | 4 (6.3) | sul1, blaTEM-1 | SUL, NA, TE AM, S, GM, SAM | – | B (4) | N/A | 4 | – |
| 1200 | 2 (3.1) | sul1, sul2, blaTEM-1 | SUL, NA, TE AM | – | C1 (2) | N/A | 2 | – |
| 1550 | 2 (3.1) | sul1, blaTEM-1 | SUL, NA, TE AM S, GM, CIP | – | C2 (2) | S. Kentucky | 2 | – |
| 1950 | 5 (7.8) | sul1, blaTEM-1 | SUL, NA, TE, CIP | – | C2 (5) | S. Kentucky | 4 | 1 |
| No amplicon | 30 (46.9) | sul1, sul2, blaTEM-1, blaSHV-1 | SUL, NA, TE | – | B (5), C1 (6), C2 (19) | S. Kentucky (18), N/A (12) | 26 | 4 |
| No amplicon | 4 (6.3) | sul1, sul2, blaTEM-1, blaSHV-1 | SUL, NA, TE AM, S, CTX, ATM | + | B (2), C2 (2) | S. Kentucky (1), N/A (2) | 3 | 1 |
‡, N/A: not applicable.
†, Antibiotics listed in the antibiotic profile are those that demonstrated 100% resistance with all tested isolates.
AM, Ampicillin; ATM, Azetronam; C, Chloramphenicol; CAZ, Ceftazidime; CIP, Ciprofloxacin; CTX, Cefotaxime; GM, Gentamicin; NA, Nalidixic acid; S, Streptomycin; SAM, Ampicillin/sulbactam; SUL, Sulfonamide compounds; SXT, Sulfamethoxazole/Trimethoprim; TE, Tetracycline; TIM, Ticarcillin clavulanate.