TABLE 2.
Frequency of high-level aminoglycoside resistance patterns of Enterococcus spp. from the poultry production environment
| Species or group | No. of isolates with resistance phenotype(s) (% of species)b
|
|||
|---|---|---|---|---|
| HLS | HLK | HLS + HLK | HLK + HLG | |
| E. casseliflavus | 1 (25) | 0 | 1 (25) | 0 |
| E. durans | 1 (20) | 1 (20) | 0 | 0 |
| E. faecalis | 62 (35) | 15 (8.5) | 5 (2.8) | 13 (7.4) |
| E. faecium | 29 (28) | 28 (27) | 13 (13) | 0 |
| E. gallinarum | 7 (35) | 1 (5.0) | 1 (5.0) | 0 |
| E. hirae | 1 (7.7) | 2 (15) | 1 (7.7) | 0 |
| Group IIa | 1 (20) | 0 | 0 | 0 |
| Group IIIa | 2 (67) | 0 | 0 | 0 |
| Total | 104 (31) | 47 (14) | 21 (6.3) | 13 (3.9) |
a
As defined by Facklam and Collins (13).
b
Resistance breakpoints for Enterococcus spp. were >1,000 μg/ml for high-level streptomycin (HLS) resistance and >500 μg/ml for high-level kanamycin (HLK) and high-level gentamicin (HLG) resistance.