1. Aichi Prefectural Chuo Livestock Hygiene Service Center, 1-306 Jizono, Miaicho, Okazaki, Aichi 444-0805, Japan
2. Miyazaki Prefectural Livestock Hygiene Service Center, 3151-1 Shimonaka, Sadowaracho, Miyazaki, Miyazaki 880-0212, Japan
3. Hinode Animal Clinic, 4-1 Owaki, Heijimacho, Yatomi, Aichi 498-0031, Japan
4. Aichi Prefectural Tobu Livestock Hygiene Service Center, 51-1 Konami, Nishimiyukicho, Toyohashi, Aichi 441-8113, Japan
5. Division of Pathology and Pathophysiology, National Institute of Animal Health, National Agriculture and Food Research Organization (NARO), 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan
6. Department of Veterinary Medical Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
7. Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-Oraikita, Izumisano, Osaka 598-8531, Japan