Table 2. Detail of double-disk synergy test-positive isolates.
| Strain name | Year isolated | O serogroup | Virulence factors | β-lactamase | Resistance | Use of antimicrobial |
|---|---|---|---|---|---|---|
| E2499 | 2005 | UT | STa, STb, F4 | TEM-1, CTX-M-15 |
AMP, PIP, CFZ, CXM, CTX, FEP, ATM, GEN, KAN, STR, TET, CHL, NAL, CIP, LVX, GAT, SXT | Unknown |
| E2525 | 2006 | UT | EAST1 | TEM-1, CTX-M-14 |
AMP, PIP, CFZ, CXM, CTX, FEP, GEN, STR, TET, NAL, CIP, LVX, GAT, SXT | Ampicillin, Lincomycin |
| E2619 | 2010 | 34 | - | CTX-M-24 | AMP, PIP, CFZ, CXM, CTX, ATM, STR, TET, CHL, NAL, CIP, LVX, GAT, SXT | Not used |
| E2642 | 2013 | 23 | - | TEM-1, SHV-12 |
AMP, PIP, CFZ, CTX, ATM, STR, TET | Unknown |
| E2646 | 2013 | 8 | EAST1 | CTX-M-61 | AMP, PIP, CFZ, CXM, CTX, CHL, SXT | Ceftiofur, Fluoroquinolone |
AMP, ampicillin; PIP, piperacillin; CFZ, cefazolin; CXM, cefuroxime; CTX, cefotaxime; FEP, cefepime; ATM, aztreonam; GEN, gentamicin; KAN, kanamycin; STR, streptomycin; TET, tetracycline; CHL, chloramphenicol; NAL, nalidixic acid; CIP, ciprofloxacin; LVX, levofloxacin; GAT, gatifloxacin; SXT, trimethoprim-sulfamethoxazole.