1. Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo 183–8509, Japan
2. The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagito, Gifu 501-1193, Japan
3. Gifu Central Livestock Hygiene Service Center, 4-2-22 Imamine, Gifu, Gifu 500-8388, Japan
4. Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo 183-8509, Japan
5. Faculty of Bioresources and Environmental Sciences, Ishikawa prefectural University, 1-308, Suematsu, Nonoichi-shi, Ishikawa 921-8836, Japan
6. Azabu University, School of Veterinary Medicine, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan