1. Department of Animal Health; Prince Leopold Institute of Tropical Medicine; Nationalestraat 155 B-2000 Antwerp Belgium
2. Laboratory of Veterinary Parasitology; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 B-9820 Merelbeke Belgium
3. Department of Small Animal Medicine; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 B-9820 Merelbeke Belgium