1. Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1-3, 612 42 Brno, Czech Republic
2. Veterinary Research Institute, Hudcova 70, 621 00 Brno, Czech Republic
3. Parasitological Institute SAV, Hlinkova 3, 040 01 Kosice, Slovakia
4. Department of Biology and Ecology, Faculty of Natural Sciences, P. J. Safarik University, Moyzesova 11, Kosice, Slovakia
5. Department of Oncological and Experimental Pathology, Masaryk Memorial Cancer Institute, Zluty Kopec 7, 656 53, Brno Czech Republic