1. a Research Group Veterinary Public Health and Zoonoses, Department of Pathology, Bacteriology and Avian Diseases , Faculty of Veterinary Medicine, Ghent University , Salisburylaan 133, B-9820 , Merelbeke , Belgium
2. b Departmaent of Clinical Sciences, Faculty of Veterinary Medicine , Shahrekord University , Saman Road, PO Box 115, Shahrekord , Iran
3. c Department of Morphology, Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133, B-9820 , Merelbeke , Belgium
4. d Department of Poultry, Fish and Fur animals , Danish Institute for Food and Veterinary Research , Hangoevej 2, DK-8200 , Aarhus , Denmark
5. e Research Group Veterinary Public Health and Zoonoses, Department of Reproduction, Obstetrics and Herd Health , Faculty of Veterinary Medicine, Ghent University , Salisburylaan 133, B-9820 , Merelbeke , Belgium