1. Graduate of Veterinary Medicine, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran
2. Department of Pathobiology, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran
3. Department of Clinical Sciences; Faculty of Veterinary Medicine, Semnan University, Semnan, Iran
4. Department of Microbiology, Faculty of Veterinary Medicine, Tehran University, Tehran, Iran