Table 3.
MLS resistance phenotypes and genotypes in ER-R coagulase-positive S. aureus and ER-R CoNS isolates
| Species | Total number | Erythromycin-resistant number | Phenotype | The number of isolates containing resistance genes | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| iMLS | % | cMLS | % | MS | % | lnuA | ermB | ermC | msrA/B | mphC | ereA | vgaA | |||
| S. chromogenes | 11 | 6 | 5 | 83.3 | 1 | 16.7 | 0 | 0 | 6 | 2 | 3 | 3 | 1 | 1 | 2 |
| S. sciuri | 9 | 2 | 0 | 50 | 1 | 0 | 1 | 50 | 2 | 2 | 0 | 1 | 0 | 0 | 0 |
| S. warneri | 2 | 2 | 0 | 0 | 0 | 0 | 2 | 100 | 2 | 1 | 0 | 1 | 1 | 0 | 0 |
| S. haemolyticus | 31 | 30 | 18 | 62 | 12 | 40 | 0 | 0 | 30 | 11 | 22 | 26 | 14 | 4 | 12 |
| S. epidermidis | 7 | 6 | 5 | 83.3 | 1 | 16.7 | 0 | 0 | 6 | 2 | 6 | 7 | 1 | 1 | 1 |
| S. hyicus | 3 | 3 | 0 | 0 | 3 | 100 | 0 | 0 | 3 | 3 | 2 | 2 | 1 | 1 | 1 |
| S. saprophyticus | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 100 | 1 | 0 | 1 | 1 | 1 | 0 | 1 |
| S. simulans | 5 | 4 | 2 | 50 | 2 | 50 | 0 | 0 | 4 | 0 | 2 | 2 | 1 | 0 | 4 |
| CoN S. aureus a | 28 | 11 | 10 | 91 | 0 | 0 | 1 | 9 | 11 | 3 | 10 | 8 | 5 | 2 | 2 |
| Total CoNS | 97 | 65 | 40 | 61.5 | 20 | 30.8 | 5 | 7.7 | 65 | 23 | 46 | 51 | 25 | 9 | 23 |
| CoP S. aureus b | 121 | 40 | 38 | 95 | 2 | 5 | 0 | 0 | 40 | 14 | 38 | 6 | 27 | 14 | 10 |
iMLS, inducible expression of clindamycin resistance
cMLS, constitutive expression of clindamycin resistance
MS, erythromycin-resistant, clindamycin-susceptible, no induction
CoN S. aureus a, coagulase-negative S. aureus
CoP S. aureus b, coagulase-positive S. aureus