1. Department of Animal and Poultry Behaviour and Management, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
2. Department of Pathology and Clinical Pathology, Faculty of Veterinary Medicine, Sohag University, Sohag, Egypt
3. Department of Poultry Diseases, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
4. Department of Animal Hygiene, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
5. Institute of Pathology, Charité University Hospital Berlin, Germany
6. Electron Microscope Unit, Assiut University, Assiut, Egypt
7. Physics Department, Faculty of Science, Assiut University, Assiut, Egypt
8. Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO, USA
9. Zoonoses Department, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
10. Department Animal Hygiene, Faculty of Veterinary medicine, New Valley University, Kharga Oasis, Egypt