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Effect of deltamethrin and flumethrin as main treatment in eradication of lice in 33 dairy herds.
| Medicament | No. herds | 3–6 months after the eradications | 15–18 months after the eradications | ||
| Free | Lice present | Free | Lice present | ||
| Deltamethrin | 17 | 14 | 3 | 9 | 3+5 |
| Flumethrin | 16 | 14 | 2 | 10 | 2+4 |
