1. Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
2. Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Germany
3. Department of Avian Medicine, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
4. Department of Clinical Sciences, Faculty of Veterinary Medicine, Islamic Azad University, Karaj Branch, Karaj, Iran