1. Microbiology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.
2. Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
3. Medical Microbiology and Immunology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
4. Human Anatomy and Embryology Department, and Faculty of Medicine, Zagazig University, Zagazig, Egypt.
5. Medical Physiology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.