Table 2.
Antimicrobial susceptibilities of environmental methicillin-resistant Staphylococcus pseudintermedius (MRSP) isolates.
| Antimicrobial | Antimicrobial class | Resistant isolates — n (%) | Susceptible isolates — n (%) | Intermediate isolates — n (%) |
|---|---|---|---|---|
| Amoxicillin/Clavulanic acid | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Ampicillin | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Cefazolin | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Cefpodoxime | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Cephalothin | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Oxacillin + 2% NaCl | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Penicillin | β-lactam | 36 (100.0) | 0 (0.0) | 0 (0.0) |
| Enrofloxacin | Quinolone | 19 (52.8) | 13 (36.1) | 4 (11.1) |
| Marbofloxacin | Quinolone | 19 (52.8) | 17 (47.2) | 0 (0.0) |
| Doxycycline | Tetracycline | 14 (38.9) | 22 (61.1) | 0 (0.0) |
| Tetracycline | Tetracycline | 14 (38.9) | 19 (52.8) | 3 (8.3) |
| Chloramphenicol | Phenicol | 1 (2.8) | 29 (80.6) | 6 (16.7) |
| Clindamycin | Lincosamide | 19 (52.8) | 17 (42.7) | 0 (0.0) |
| Gentamicin | Aminoglycoside | 21 (58.3) | 10 (27.8) | 5 (13.9) |
| Rifampin | Ansamycin | 0 (0.0) | 36 (100.0) | 0 (0.0) |
| Trimethoprim/Sulfamethoxazole | Folate pathway inhibitor | 20 (55.6) | 16 (44.4) | 0 (0.0) |
Minimum inhibitory concentration antimicrobial susceptibility testing using broth dilution was performed on all MRSP isolates (n = 36). Shown here are the proportions of isolates that were resistant, susceptible, or intermediate to 16 antimicrobials from 8 classes using CLSI breakpoints (18).