TABLE 1.
Characterization of selected multiresistance phenotypes of Enterococcus spp. from the poultry production environment
| Species or group | No. of isolates (% of total)a | % frequency distribution of resistance phenotypeb
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | LM | LP | LS | LT | LMP | LMS | LMT | LPS | LPT | LST | LMPS | LMPT | LMST | LPST | LMPST | M | MP | P | PT | ||
| E. avium | 1 (0.3) | 100 | |||||||||||||||||||
| E. casseliflavus | 4 (1.2) | 25 | 25 | 25 | 25 | ||||||||||||||||
| E. durans | 5 (1.5) | 80 | 20 | ||||||||||||||||||
| E. faecalis | 176 (53.2) | 6.8 | 2.3 | 4.0 | 24 | 63 | |||||||||||||||
| E. faecium | 104 (31.4) | 2.9 | 1.0 | 2.9 | 1.0 | 8.7 | 3.8 | 1.0 | 11 | 14 | 1.0 | 1.0 | 4.8 | 32 | 11 | 1.0 | 1.9 | 1.0 | 1.0 | ||
| E. gallinarum | 20 (6.0) | 5.0 | 25 | 30 | 15 | 15 | 10 | ||||||||||||||
| E. hirae | 13 (3.9) | 7.7 | 23 | 23 | 7.7 | 7.7 | 7.7 | 7.7 | 15 | ||||||||||||
| Group IIc | 5 (1.5) | 20 | 80 | ||||||||||||||||||
| Group IIIc | 3 (0.9) | 66 | 33 | ||||||||||||||||||
| Total | 331 (100) | 1.5 | 2.7 | 0.9 | 5.4 | 2.4 | 2.7 | 1.2 | 5.1 | 0.3 | 3.9 | 19 | 0.3 | 0.3 | 36 | 11 | 5.1 | 0.3 | 0.6 | 0.3 | 0.3 |
a
Isolate numbers represent the data set subsequent to the removal of apparent nondistinct isolates recovered from a given sample.
b
Resistance phenotype as defined by break points of ≥16 μg/ml for lincomycin (L), >4 μg/ml for erythromycin (M), >8 μg/ml for penicillin (P), ≥4 μg/ml for quinupristin-dalfopristin (S), and >8 μg/ml for tetracycline (T).
c
As defined by Facklam and Collins (13).