1. Department of Parasitology and Animal Diseases, Veterinary Research Division, National Research Centre, Cairo, Egypt.
2. Department of Physiology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt; Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia.
3. Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia.