1. Department of Applied Veterinary Sciences, United Graduated School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
2. Laboratory of Veterinary Microbiology, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
3. Department of Animal Medicine, Faculty of Veterinary Medicine, Damanhour University, El-Beheira, Egypt
4. Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan