1. Department of Pathogenetic Veterinary Sciences, The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
2. Department of Veterinary Pathology, Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, Iwate 020-8550, Japan
3. Department of Pathology, Faculty of Veterinary Medicine, South Valley University, Qena 83523, Egypt