TABLE 2.
Resistance genotypes of erythromycin-resistant isolates of S. aureus and CNS
| Organism and phenotypea | No. of isolates available for PCR/total no. of isolates | No. of isolates with genotype:
|
|||||
|---|---|---|---|---|---|---|---|
| ermA | ermC | msrA | ermA msrA | ermC msrA | ermA ermC msrA | ||
| S. aureus | 86/114 | ||||||
| Cs | 31/41 | 0 | 0 | 31 | 0 | 0 | 0 |
| Cr-ind | 28/34 | 8 | 20 | 0 | 0 | 0 | 0 |
| Cr-const | 27/39 | 22 | 0 | 0 | 0 | 5 | 0 |
| CNS | 100/100 | ||||||
| Cs | 18/18 | 0 | 0 | 18 | 0 | 0 | 0 |
| Cr-ind | 25/25 | 5 | 18 | 0 | 1c | 1c | 0 |
| Cr-const | 57/57 | 13 | 33 | 1b | 3d | 3e | 4f |
a
Determined by standard disk diffusion test and disk induction test C, clindamycin; S, susceptible; r-ind, inducible MLSB resistance; r-const, constitutive MLSB resistance.
b
One isolate of S. stimulans (see text).
c
One S. epidermidis isolate.
d
Three S. epidermidis isolates.
e
Three S. haemolyticus isolates.
f
Four S. haemolyticus isolates.