TABLE 5.
Distribution of zinc and QAC resistance by methicillin-resistant Staphylococcus aureus spa type
| Resistance gene/phenotype | No. (%) of isolates with indicated spa typea |
||||
|---|---|---|---|---|---|
| t034 (n = 23) | t571 (n = 15) | t002 (n = 1) | t3075 (n = 1) | Total (n = 40) | |
| qacAB | 0 (0) | 1 (6.7) | 0 | 0 | 1 (2.5) |
| qacG | 23 (100) | 11 (73.3) | 1 (100) | 1 (100) | 36 (90) |
| qacH | 11 (47.8) | 11 (73.3) | 1 (100) | 0 | 23 (57.5) |
| qacJ | 0 | 0 | 0 | 0 | 0 |
| smr | 13 (56.5) | 11 (73.3) | 0 | 1 (100) | 25 (62.5) |
| ≥2 QAC resistance genes | 17 (73.9) | 11 (73.3) | 1 (100) | 1 (100) | 30 (75) |
| Mean MIC of BKC (μg/ml) | 3.6 | 3.0 | 2 | 2 | 3.3 |
| czrC | 23* (100) | 1* (6.7) | 0 | 1 (100) | 25 (62.5) |
| Mean MIC of ZnCl2 (mM) | 8.78* | 3.73* | 2 | 16 | 6.9 |
a
An asterisk indicates significant differences between spa types (P < 0.05).