Table 2.
Prevalence of S. aureus according to breeding type, breed and antimicrobial treatment
| Variable | Category | No. of farms | No. of sampled animals | S. aureus-positive | MRSA-positive | ||
|---|---|---|---|---|---|---|---|
| No. (%) | P-value | No. (%) | P-value | ||||
| Breeding type | Intensive | 25 | 405 | 350 (86.4) | NS | 218 (53.8) | > 0.001 |
| Non-intensive | 7 | 70 | 40 (57.1) | 1 (1.4) | |||
| Total | 32 | 475 | 390 (82.1) | 219 (46.1) | |||
| Breed | Black pig | 11a | 77 | 47 (61.0) | NS | 7 (9.1) | > 0.001 |
| Other breeds | 25 | 398 | 343 (86.2) | 212 (53.3) | |||
| Total | 32 | 475 | 390 (82.1) | 219 (46.1) | |||
| Antimicrobial treatment | Treatedb | – | 60 | 57 (95.0) | NS | 45 (75.0) | 0.010 |
| Untreated | – | 415 | 333 (80.2) | 174 (41.9) | |||
| Total | – | 475 | 390 (82.1) | 219 (46.1) | |||
aA minority of black pigs were occasionally reared also in 4 intensive farms
bOngoing or suspended in the last twenty days
NS, Not significant