1. Department of Pathology & Clinical Pathology, Faculty of Veterinary Medicine, South Valley University, Qena 83523, Egypt
2. Department of Pathology, Faculty of Veterinary Medicine, Kafr-Elsheikh University, Kafr-Elsheikh 33516, Egypt
3. Department of Fish Diseases and Mangment, Faculty of Veterinary Medicine, New Valley Branch, Assuit University, El-Kharja 72511, Egypt
4. Department of Pathogenetic Veterinary Science, United Graduated School of Veterinary Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan