Table 2. Prevalence of Staphylococcus aureus nasal carriage, US beefpacking workers (n = 137).
Characteristic | Prevalence % (n) | Prevalence ratio for S. aureusb | Multidrug resistant S. aureus % (n)c | PVL-positive % (n)d |
---|---|---|---|---|
Staphylococcus aureus (all) | 27.0 (37/137) | - | 10.2 (14/137) of all subjects; 38.9 (14/37) of S. aureus carriers | 2.9 (4/137) |
Methicillin-sensitive S. aureus (MSSA) | 23.3 (32/137) | 86.5 | 28.1 (9/32) | 0 (0/5) |
Methicillin-resistant S. aureus (MRSA) | 3.6 (5/137) | 13.5 | 100 (5/5) | 80.0 (4/5) |
Putative livestock-associated S. aureus (pLA-SA)a | 3.6 (5/137) | 13.5 | 40.0 (2/5) | 0 (0/5) |
a Defined as all scn-negative S. aureus; all pLA-SA isolates were MSSA
b Prevalence ratio defined as: # S. aureus isolates in specific category/all S. aureus positive isolates (n = 37)
c Defined as resistant to ≥3 antibiotics tested
d Positive for the lukS-PV and lukF-PV genes by real-time PCR