Table 2.
Resistance Phenotypes Resulting from Interpretation of MIC Values
| No. of isolates | |||
|---|---|---|---|
| Relevant phenotypes and/or genotypes | MRSA | MSSA | Total |
| Resistance to rifamycines | 83 | 11 | 94 |
| Resistance to quinolones | 216 | 21 | 237 |
| Partially resistant | 83 | 10 | 93 |
| Resistant | 133 | 11 | 144 |
| Resistance to fusidic acid | 74 | 5 | 79 |
| Resistance to tetracyclines | 127 | 40 | 167 |
| Resistance to β-lactamsa | 265 | 121 | 386 |
| Modification of PBP (mecA) | 264 | 264 | |
| Acquired penicillinase | 1 | 121 | 122 |
| Resistance to oxazolidinone | 1 | 2 | 3 |
| Resistance to aminoglycosides | 265 | 159 | 424 |
| Resistant to KAN (aph[3’]-III) | 173 | 144 | 317 |
| Resistant to KAN TOB GEN (ant[2]-Ia) | 92 | 15 | 107 |
| Resistance to trimethoprim/sulfonamids | 7 | 7 | |
| Resistance to macrolides/lincosamides | 258 | 156 | 414 |
| MLSB induciblea,b | 11 | 16 | 27 |
| MLSB constitutiveb | 195 | 13 | 208 |
| MSBb | 3 | 3 | 6 |
| Other | 49 | 124 | 173 |
a
Resistance mechanisms detected by VITEK 2.
b
Resistance mechanisms detected by D test.
MIC, minimum inhibitory concentration; MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-sensitive S. aureus; PBP, penicillin-binding protein; GEN, gentamicin; KAN, kanamycin; TOB, tobramycin; MLSB, macrolides, lincosamides, streptogramins B.