From: Bulk milk ELISA and the diagnosis of parasite infections in dairy herds: a review
Country (region)
Number of herds
Prevalence
Reference
Belgium
Conventional 1,800
59.1% (95% CI, 56.8-61.4%)
[39]
Sweden
Organic 113
0.82% (95% CI, 0.78-0.86%)
[36]
Conventional 113
0.66% (95% CI, 0.61-0.71%)