TABLE 1.
Antimicrobial resistance profiles in enterococci isolated from broiler fecal samples
| Suppliera | No. of isolates testeda | Number (%) resistant
|
|||
|---|---|---|---|---|---|
| Vancomycin | Avilamycinc | Erythromycin | Bacitracinc | ||
| A | 185 | 12 (6.5) | 34 (18.4) | 145 (78.4) | 183 (98.9) |
| Ab | 104 | 4 (3.9) | 19 (18.3) | 77 (74) | 103 (99) |
| B | 56 | 1 (1.8) | 2 (3.6) | 10 (17.9) | 55 (98.2) |
| C | 37 | 5 (13.5) | 2 (5.4) | 15 (40.5) | 36 (97.3) |
| Total | 382 | 22 (5.8) | 57 (14.9) | 247 (64.7) | 377 (98.7) |
a
Enterococci were isolated using m-Enterococcus agar lacking antimicrobials.
b
Samples taken from supplier A, with broilers currently on an antimicrobial-free feeding regime.
c
See Materials and Methods for breakpoints used.