1. Joint Faculty of Veterinary Medicine, Kagoshima University, Korimoto, Kagoshima 890–0065, Japan
2. Research and Education Center for Prevention of Global Infectious Diseases of Animal, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183–8509, Japan
3. Department of Virology II, National Institute of Infectious Diseases, Musashimurayama, Tokyo 208–0011, Japan
4. Kumage Agricultural Mutual Aid Associations, Noma Nakatane, Kumage-gun, Kagoshima 891–3604, Japan
5. Hokusatsu Agricultural Mutual Aid Associations, Todoro Satsuma, Satsuma-gun, Kagoshima 895–1813, Japan
6. Kurayoshi Livestock Hygiene Service Center, Kiyotani, Kurayoshi, Tottori 683–0017, Japan
7. Ishikawa Hokubu Livestock Hygiene Service Center, Otsu, Nanao, Ishikawa 929–2126, Japan
8. Faculty of Veterinary Science, Nippon Veterinary and Life Science University, Musashino, Tokyo 180–8602, Japan