Table 1. Characteristics of E. coli isolates.
| Isolate | Specimen | Resistance profile | MICs (µg/ml) | bla gene | Qnr determinant | Sequence type | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CTX | CAZ | FEP | ATM | CRO | NA | CIP | LEV | CT | ||||||
| E. coli S1 | Broiler breeders | AM, TIC, PIP, CZ, CF, CTX, NA, TE, SSS | >32 | 3 | 12 | 6 | 64 | >256 | 0.25 | 0.5 | 0.125 | CTX-M-1 | qnrS1 | ST461 |
| E. coli S2 | Hatching eggs | AM, TIC, PIP, CZ, CF, CTX, NA, TE, SSS | >32 | 3 | 12 | 6 | 128 | >256 | 0.38 | 0.75 | 0.125 | CTX-M-1 | qnrS1 | ST461 |
MIC, minimum inhibitory concentration; AM, ampicillin; TIC, ticarcillin; PIP, piperacillin; CZ, cefazollin; CF, cephalothin; CTX, cefotaxime; CAZ, ceftazidime; FEP: cefepime; ATM, aztreonam; CRO, cefriaxone; NA, nalidixic acid; CIP, ciprofloxacin; LVX, levofloxacin; TE, tetracycline; SSS, sulfonamides; CT, colistin.