Table 2.
Case Tracing in Human Cases, Distributed by Type of Known Exposure to Methicillin-Resistant Staphylococcus aureus
| Exposure | Persons MRSA Positive, No./Persons Sampled, No. (AR, %) |
OR (95% CI) | |||
|---|---|---|---|---|---|
| Outbreak 1 | Outbreak 2 | Outbreak 3 | Total | ||
| Working in sow pig farm | 10/19 (52.6) | 3/39 (7.7) | 1/4 (25.0) | 14/62 (22.6) | Reference |
| Working in finishing pig farm | 5/29 (17.2) | 4/34 (11.8) | … | 9/63 (14.3) | 0.63 (.24–1.57) |
| Veterinary practitioner | 2/11 (18.2) | 1/4 (25.0) | … | 3/15 (20.0) | 0.89 (.16–3.17) |
| Working in slaughterhouse | 9/107 (8.4) | 1/17 (5.9) | … | 10/124 (8.06) | 0.36 (.14–.86) |
| Household members | 0/5 (0.0) | 0/3 (0.0) | … | 0/8 (0.0) | … |
| Total | 26/171 (15.2) | 9/97 (9.3) | 1/4 (25.0) | 36/272 (13.2) | … |
Abbreviations: AR, attack rate; CI, confidence interval; MRSA, methicillin-resistant Staphylococcus aureus; OR, odds ratio.