1. Department of Veterinary Medicine, Infectious Diseases Division, Faculty of Veterinary Medicine Suez Canal University Ismailia Egypt
2. Laboratory of Research and Development in Veterinary Vaccines (LRDVV), Faculty of Veterinary Medicine Suez Canal University Ismailia Egypt
3. Department of Animal Medicine, Faculty of Veterinary Medicine Kafrelsheikh University Kafrelsheikh Egypt
4. Department of Virology, Faculty of Veterinary MedicineSuez Canal UniversityIsmailiaEgypt