Table 2.
Antimicrobial resistance of staphylococcal species isolated from farmed and household chicken.
| Antimicrobial1 | No. resistant (%) |
No. (%) resistant isolates with targeted gene |
||||
|---|---|---|---|---|---|---|
| Breakpoint (μg/mL) | Farmed (n = 51) | Household (n = 43) | Targeted gene2 | Farmed | Household | |
| Oxacillin | ≥ 0.5 | 17 (33.3) | 19 (44.2) | mec A | 0 (0) | 3 (15.8) |
| Cefoxitin | ≥ 8 | 0 (0) | 3 (7) | mecA | 0 (0) | 0 (0) |
| Penicillin | ≥ 0.25 | 8 (15.7) | 19 (44.2) | mecA | 0 (0) | 3 (15.8) |
| Erythromycin | ≥ 8 | 34 (66.7) | 30 (69.8) | erm C | 23 (67.6) | 25 (83.3) |
| Clindamycin | ≥ 4 | 35 (68.6) | 31 (72.1) | erm C | 23 (65.7) | 25 (80.6) |
| Synercid (quinupristin/dalfopristin) | ≥ 4 | 15 (29.4) | 16 (37.2) | vat A, B, C | 0 (0) | 0 (0) |
| Daptomycin | ≥ 1 | 1 (2) | 0 (0) | n/t | – | – |
| Levofloxacin | ≥ 4 | 8 (15.7) | 14 (32.6) | n/t | – | – |
| Moxifloxacin | ≥ 2 | 4 (7.8) | 11 (25.6) | n/t | – | – |
| Mupirocin | 256 | 1 (2) | 0 (0) | n/t | – | – |
| Tetracycline | ≥ 16 | 34 (66.7) | 28 (65.1) | tet K/tet M | 20 (58.8) | 9 (32.1) |
| Tigecycline | ≥ 0.25 | 38 (74.5) | 25 (58.1) | n/t | – | – |
| Trimethoprim/sulfamethoxazole | ≥ 4/76 | 1 (2) | 0 (0) | n/t | – | – |
Abbreviation: n/t, not tested.
1
No isolates were resistant to gentamicin, linezolid, nitrofurantoin, or vancomycin.
2
Seven farmed isolates and 7 household isolates from chickens were positive for aac-aph, but susceptible to gentamicin.