1. Department of Avian and Rabbit Medicine, Faculty of Veterinary Medicine Zagazig University Zagazig Egypt
2. Department of Microbiology, Faculty of Veterinary Medicine Zagazig University Zagazig Egypt
3. Department of Mycoplasma Research Animal Health Research Institute Giza Egypt
4. National Laboratory for Veterinary Quality Control on Poultry Production Animal Health Research Institute, Agricultural research center Giza Egypt
5. Department of Pathology, Faculty of Veterinary Medicine Zagazig University Zagazig Egypt
6. Animal Wealth Development Department, Faculty of Veterinary Medicine Zagazig University Zagazig Egypt