Table 3. Phenotypic and molecular characteristics of S. aureus carriage among study participants by livestock exposure group, North Carolina, 2011.
ILO | AFLO | Prevalence Ratio | |||
No. positive/ | % | No. positive/ | % | (95% CI)a | |
Total | Total | ||||
S. aureus | 41/99 | 41.4 | 42/105 | 40.0 | 1.0 (0.7, 1.5) |
Worker | 34/80 | 42.5 | 35/92 | 38.0 | 1.1 (0.8, 1.7) |
Household Member | 7/19 | 36.8 | 7/13 | 53.8 | |
MRSA | 3/41 | 7.3 | 3/42 | 7.1 | 1.0 (0.2, 6.0) |
Worker | 3/34 | 8.8 | 3/35 | 8.6 | 1.0 (0.2, 5.9) |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 | |
MDRSA | 15/41 | 36.6 | 8/42 | 19.0 | 1.9 (0.9, 4.0) |
Worker | 13/34 | 38.2 | 8/35 | 22.9 | 1.7 (0.8, 3.5) |
Household Member | 2/7 | 28.6 | 0/7 | 0.0 | |
Tetracycline-resistant S. aureus | 19/41 | 46.3 | 1/42 | 2.4 | 19.5 (2.7, 140) |
Worker | 19/34 | 55.9 | 1/35 | 2.9 | 19.6 (2.7, 140) |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 | |
S. aureus CC398 | 13/41 | 31.7 | 1/42 | 2.4 | 13.3 (1.8, 98.7) |
Worker | 13/34 | 38.2 | 1/35 | 2.9 | 13.4 (1.8, 98.0) |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 | |
scn- negative S. aureus | 17/41 | 41.5 | 6/42 | 14.3 | 2.9 (1.3, 6.4) |
Worker | 15/34 | 44.1 | 6/35 | 17.1 | 2.6 (1.2, 5.7) |
Adult Household Member | 2/7 | 28.6 | 0/7 | 0.0 | |
scn- negative, tetracycline-resistant S. aureus CC398 | 11/41 | 26.8 | 0/42 | 0.0 | – b |
Worker | 11/34 | 32.3 | 0/35 | 0.0 | – b |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 | |
scn– negative MRSA CC398 | 2/41 | 4.9 | 0/42 | 0.0 | – b |
Worker | 2/34 | 5.9 | 0/35 | 0.0 | – b |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 | |
scn- negative MDRSA CC398 | 6/41 | 14.6 | 0/42 | 0.0 | – b |
Worker | 6/34 | 17.6 | 0/35 | 0.0 | – b |
Household Member | 0/7 | 0.0 | 0/7 | 0.0 |
ILO = industrial livestock operation.
AFLO = antibiotic-free livestock operation.
PR = prevalence ratio.
PR (95% CI) comparing carriage among ILO participants to AFLO participants.
No estimate of the PR (95% CI) is provided due to no occurrence of the outcome of interest in at least one group.