Table 4. Associations between reported work activities and carriage of MDRSA and tetracycline-resistant scn-negative S. aureus CC398 among ILO workersa carrying S. aureus.
Total | MDRSA | Tetracycline-resistant scn-negative S. aureus CC398 b | ||||||
N = 34 | N = 13 | Prevalence | PR (95% CI) | N = 11 | Prevalence | PR (95% CI) | ||
Direct contact with pigs | ||||||||
No | 6 | 2 | 33.3 | Ref | 1 | 16.7 | Ref | |
Yes | 28 | 11 | 39.3 | 1.2 (0.3, 4.4) | 10 | 35.7 | 2.1 (0.3, 14.4) | |
Direct contact with poultry | ||||||||
No | 28 | 11 | 39.3 | Ref | 10 | 35.7 | Ref | |
Yes | 6 | 2 | 33.3 | 0.8 (0.2, 3.1) | 1 | 16.7 | 0.5 (0.1, 3.1) | |
Were cut/scratched while in direct contact with livestock | ||||||||
No | 22 | 9 | 40.9 | Ref | 8 | 36.4 | Ref | |
Yes | 12 | 4 | 33.3 | 0.8 (0.3, 2.0) | 3 | 25.0 | 0.7 (0.2, 2.2) | |
Draw blood/collect fluids from pigs | ||||||||
No | 27 | 8 | 29.6 | Ref | 10 | 37.0 | Ref | |
Yes | 7 | 5 | 71.4 | 2.4 (1.1, 5.1) | 1 | 14.3 | 0.4 (0.1, 1.9) | |
Work with breeding pigs | ||||||||
No | 23 | 6 | 26.1 | Ref | 5 | 21.7 | Ref | |
Yes | 11 | 7 | 63.6 | 2.4 (1.0, 5.7) | 6 | 54.5 | 2.5 (1.0, 6.4) | |
Handle livestock that were dead | ||||||||
No | 5 | 2 | 40 | Ref | 3 | 60.0 | Ref | |
Yes | 29 | 11 | 37.9 | 0.9 (0.3, 3.1) | 8 | 27.6 | 0.5 (0.2, 1.1) |
ILO = industrial livestock operation.
PR = Prevalence ratio.
Associations among AFLO workers are not presented due to small numbers of reported activities in the group who carried S. aureus.
Due to overlap among tetracycline-resistance, scn-negative, and CC398 isolates and similarity of estimates, we present prevalence ratios and 95% confidence intervals for tetracycline-resistant scn-negative S. aureus CC398.