1. Department of Parasitology, Veterinary Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey.
2. Department of Virology, Veterinary Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey.
3. Department of Microbiology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey.
4. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA.