1. Tropical Veterinary Institute, Veterinary College, University of Liege, 20 Boulevard de Colonster, B43, 4000 Liege, Belgium
2. Department of Animal Pathology, Veterinary College, University of Liege, 20 Boulevard de Colonster, B43, 4000 Liege, Belgium
3. Parasite Diagnostics Unit, Department of Parasitology, Institute of Tropical Medicine Antwerp, Nationalestraat 155, 2000 Antwerp, Belgium