1. Department of Parasitology, Faculty of Veterinary Medicine, Cairo University , , Giza , Egypt
2. Department of Pathology, Animal Health Research Institute , Dokki, Giza , , Egypt
3. Ministry of Agriculture, Fish Welfare Branch , El-Jubail Province , Saudi Arabia
4. Department of Pathology, Faculty of Veterinary Medicine, Cairo University , Giza , , Egypt
5. Department of Microbiology, College of Veterinary Medicine, King Faisal University , P.O. Box: 400 , Al-Ahsa , , Saudi Arabia