1. Division of Bacterial and Parasitic Disease; National Institute of Animal Health, National Agriculture and Food Research Organization; Tsukuba Ibaraki 305-0856 Japan
2. Iwate Prefectural Chuo Livestock Hygiene Service Center; Takizawa Iwate 020-0605 Japan
3. Kagoshima Prefectural Kagoshima Chuo Livestock Hygiene Service Center; Hioki Kagoshima 899-2201 Japan
4. Aichi Prefectural Chuo Livestock Hygiene Service Center; Okazaki Aichi 444-0805 Japan
5. Nagano Prefectural Matsumoto Livestock Hygiene Service Center; Matsumoto Nagano 390-0851 Japan
6. Aichi Prefectural Seibu Livestock Hygiene Service Center; Chita-gun Aichi 470-2324 Japan
7. The United Graduate School of Veterinary Sciences; Gifu University, Gifu; Gifu 501-1193 Japan