Table 4. Prevalence of antibiotic resistance (% resistant) among S. aureus isolates recovered from nasal swabs of US beefpacking workers (n = 37 S. aureus carriers).
| % Isolates resistant to antibiotic | |||||
|---|---|---|---|---|---|
| Antibiotic name a | All S. aureus | MSSAb | MRSAc | Putative livestock-associated S. aureus (pLA-SA)d | Putative human-adapted S. aureus)e |
| Levofloxicin | 2.8 | 0 | 20.0 | 0 | 3.2 |
| Ciprofloxicin | 2.8 | 0 | 20.0 | 0 | 3.2 |
| Tetracycline | 5.6 | 6.5 | 0 | 20.0 | 3.2 |
| Ceftriaxone | 13.9 | 0 | 100 | 0 | 16.1 |
| Clindamycinf | 25.0 | 25.8 | 20.0 | 40.0 | 22.6 |
| Erythromycin | 33.3 | 29.0 | 60.0 | 40.0 | 32.3 |
| Ampicillin | 72.2 | 67.7 | 100 | 60.0 | 74.2 |
| Penicillin | 80.6 | 77.4 | 100 | 80.0 | 80.7 |
aAll recovered isolates were sensitive to the following antibiotics: rifampin, linezolid, quinupristin/dalfopristin, gentamicin, and trimethoprim/sulfamethoxazole
bMethicillin-sensitive S. aureus
cMethicillin-resistant S. aureus
dPutative livestock-associated S. aureus (pLA-SA) demonstrated by lack of scn gene
ePutative human-associated S. aureus demonstrated by presence of scn gene
fD-test for inducible clindamycin resistance used to evaluate clindamycin resistance