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

Different letters: P < 0.05

Bennedsgaard et al. Acta Veterinaria Scandinavica 2006 48:24   doi:10.1186/1751-0147-48-24