1. Reference Laboratory for Quality Control on Poultry Production, Sharkia Branch, Zagazig 44516, Egypt
2. Department of Virology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Sharkia 44511, Egypt
3. Department of Avian and Rabbit Medicine, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Sharkia 44511, Egypt