Table 3.
Antimicrobial susceptibility of 139 Staphylococcus aureus isolated from nasal swab of healthcare workers and students attending the University Hospital of Londrina in southern Brazil.
| Antimicrobial | MSSA n = 99 (%) | MRSA n = 40 (%) | ||||
|---|---|---|---|---|---|---|
| S | I | R | S | I | R | |
| Penicillin | 13 (13.1) | — | 86 (86.9) | — | — | 40 (100.0) |
| Cefoxitin | 99 (100.0) | — | — | 25 (62.5) | — | 15 (37.5) |
| Oxacillin | 99 (100.0) | — | — | 28 (70.0) | — | 12 (30.0) |
| Chloramphenicol | 97 (98.0) | — | 2 (2.0) | 38 (95.0) | 1 (2.5) | 1 (2.5) |
| Ciprofloxacin | 90 (90.9) | 3 (3.0) | 6 (6.1) | 30 (75.0) | 6 (15.0) | 4 (10.0) |
| Clindamycin | 47 (47.5) | 2 (2.0) | 50 (50.5) | 8 (30.0) | 32 (80.0) | |
| Erythromycin | 34 (34.3) | 7 (7.1) | 58 (58.6) | 4 (10.0) | 1 (2.5) | 35 (87.5) |
| Gentamicin | 91 (91.9) | 1 (1.0) | 7 (7.1) | 33 (82.5) | 2 (5.0) | 5 (12.5) |
| Linezolid | 99 (100.0) | — | — | 39 (97.5) | — | 1 (2.5) |
| Rifampicin | 98 (99.0) | — | 1 (1.0) | 40 (100.0) | — | — |
| Sulfamethoxazole/Trimethoprim | 87 (87.9) | 1 (1.0) | 11 (11.1) | 36 (90.0) | 1 (2.5) | 3 (7.5) |
| Tetracycline | 93 (93.9) | 1 (1.0) | 5 (5.1) | 36 (90.0) | 1 (2.5) | 3 (7.5) |
| Tigecycline | 98 (99.0) | — | 1 (1.0) | 40 (100.0) | — | — |
| Vancomycin | 99 (100.0) | — | 40 (100.0) | — | — | |
Antimicrobial susceptibility was determined by disk diffusion, except oxacillin and vancomycin that were determined by broth microdilution assay [23] and the agar-screen test [25], respectively. Disk diffusion and microdilution results were interpreted as recommended by CLSI [23] except tigecycline that was interpreted according to the EUCAST [24]. —: not detected; S: susceptible; I: intermediate; R: resistant.