1. Department of Medical Microbiology and Immunology, Faculty of Medicine, Fayoum University, Fayoum, Egypt.
2. Department of Tropical Medicine, Faculty of Medicine, Fayoum University, Fayoum, Egypt.
3. Department of Microbiology and Immunology, Faculty of Pharmacy, Fayoum University, Fayoum, Egypt.
4. Department of Internal Medicine, Faculty of Medicine, Fayoum University, Fayoum, Egypt.