[1] Res Inst Organ Agr FiBL, CH-5070 Frick, Switzerland
[2] Univ Bern, Vetsuisse Fac, Inst Parasitol, Dept Infect Dis & Pathobiol, CH-3012 Bern, Switzerland
[3] Univ Bern, Vetsuisse Fac, Dept Clin Res & Vet Publ Hlth, Div Vet Pharmacol & Toxicol, CH-3012 Bern, Switzerland