TABLE 2.
Distribution of erm genes among MLSB-resistant staphylococcal isolates
| Straina (no.) | No. (%) of strains with:
|
||||||
|---|---|---|---|---|---|---|---|
| ermA | ermB | ermC | ermA + ermB | ermA + ermC | ermB + ermC | Other genotypeb | |
| S. aureus (144) | 91 (63.2) | 1 (0.7) | 36 (25.0) | 16 (11.1) | |||
| MLSB inducible | 14 (9.8) | 0 | 32 (22.2) | ||||
| MSSA | 5 (3.5) | 0 | 26 (18.2) | ||||
| MRSA | 9 (6.3) | 0 | 6 (4.2) | ||||
| MLSB constitutive | 77 (53.5) | 1 | 4 (2.8) | ||||
| MSSA | 3 (2.1) | 1 | 3 (2.1) | ||||
| MRSA | 74 (51.4) | 0 | 1 (0.7) | ||||
| Total | |||||||
| MSSA | 8 (5.6) | 1 (0.7) | 29 (20.1) | ||||
| MRSA | 83 (57.6) | 0 | 7 (4.9) | ||||
| Coagulase-negative staphylococci (150) | 27 (18.0) | 1 (0.7) | 66 (44.0) | 1 (0.7) | 3 (2.0) | 1 (0.7) | 51 (34.0) |
| MLSB inducible | 10 (6.6) | 0 | 31 (20.7) | 0 | 1 (0.7) | 1 (0.7) | |
| MSCNS | 1 (0.7) | 0 | 14 (9.3) | 0 | 1 (0.7) | 1 (0.7) | |
| MRCNS | 9 (6.0) | 0 | 17 (11.3) | 0 | 0 | 0 | |
| MLSB constitutive | 17 (11.3) | 1 | 35 (23.3) | 1 (0.7) | 2 (1.3) | 0 | |
| MSCNS | 1 (0.7) | 1 | 7 (4.7) | 0 | 0 | 0 | |
| MRCNS | 16 (10.7) | 0 | 28 (18.7) | 1 (0.7) | 2 (1.3) | 0 | |
| Total | |||||||
| MSCNS | 2 (1.3) | 1 (0.7) | 21 (14.0) | 0 | 1 (0.7) | 1 (0.7) | |
| MRCNS | 25 (16.7) | 0 | 45 (30.0) | 1 (0.7) | 2 (1.3) | ||
a
MSCNS, methicillin-susceptible coagulase-negative staphylococci; MRCNS, methicillin-resistant coagulase-negative staphylococci.
b
See Table 3 for more details.