Table 1. Antimicrobial drug coresistance in methicillin-resistant Staphylococcus aureus (MRSA) isolates and in methicillin-susceptible S. aureus (MSSA), Aberdeen Royal Infirmary, 1997–2000.
| Antimicrobial drug | MRSA isolates |
MSSA isolates |
||||
|---|---|---|---|---|---|---|
| No. tested for coresistance | No. resistant (%) | No. tested for coresistance | No. resistant (%) | Risk ratio | p value | |
| Ciprofloxacin | 1,218 | 1,195 (98.1) | 515 | 183 (35.5) | 13.4 | < 0.0001 |
| Clindamycin | 2,722 | 2,666 (97.9) | 7,715 | 956 (12.4) | 89.6 | < 0.0001 |
| Erythromycin | 2,721 | 2,669 (98.1) | 7,701 | 1,115 (14.5) | 90.0 | < 0.0001 |
| Fusidic acid | 2,736 | 36 (1.3) | 7,798 | 636 (8.2) | 0.20 | < 0.0001 |
| Gentamicin | 1,350 | 11 (0.8) | 3,276 | 44 (1.3) | 0.68 | NSa |
| Mupirocin | 2,514 | 154 (6.1) | 5,180 | 99 (1.9) | 1.92 | < 0.0001 |
| Rifampin | 1,005 | 62 (6.2) | 72 | 8 (11.1) | 0.95 | NS |
| Tetracycline | 997 | 109 (10.9) | 468 | 94 (20.1) | 0.76 | < 0.0001 |
| Trimethoprim | 1,060 | 18 (1.7) | 0 | – | – | – |
aNS, nonsignificant.