1. Department of Pathobiology, Institute of Parasitology, University of Veterinary Medicine, Vienna, Austria.
2. Department of Veterinary Medicine, Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia.
3. Clinical Department of Small Animals and Horses, University of Veterinary Medicine, Vienna, Austria.
4. Department of Pathobiology, Institute of Microbiology, University of Veterinary Medicine, Vienna, Austria.