Table 2 Herd averages of prevalence of S. aureus and penicillin-resistant S. aureus in different Danish herd groups of cows with high risk of infection. (no. cows = 2311)
No. herds | No. of cows tested | % of cows with SA | No. herds with SAr | % of herds with SAr | % of cows with SA | % of cows with SA with SAr isolates | |
|---|---|---|---|---|---|---|---|
Conventional (2000) | 20 | 493 | 23a | 8 | 40 | 2 | 8 |
Organic before 1995 (2000) | 18 | 391 | 25a,b | 7 | 38 | 6 | 22 |
Converting herds before conversion (1999 or 2000) | 19 | 498 | 39b | 7 | 37 | 3 | 10 |
Converting herds one year after conversion | 19 | 481 | 36a,b | 4 | 21 | 1 | 8 |
Converting herds two years after conversion | 19 | 493 | 36a,b | 8 | 36 | 3 | 7 |