1. Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11-1 Haramachi, Isogo, Yokohama, Kanagawa 235-0008, Japan
2. Division of Bacterial and Parasitic Disease, National Institute of Animal Health, National Agriculture and Food Research Organization (NARO), 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan
3. Tochigi Prefectural Kenou Livestock Hygiene Service Center, 6-8 Hiraidekogyodanchi, Utsunomiya, Tochigi 321-0905, Japan
4. Kagoshima Prefectural Kimotsuki Livestock Health and Hygiene Center,145-1 Nishiharaigawatyou, Kanoya, Kagoshima 893-0025, Japan
5. Hiroshima Prefectural Western Livestock Hygiene Service Center, 1-15 Saizyougozyoucho, Higashihiroshima, Hiroshima 739-0013, Japan
6. 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
7. Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano, Osaka 598-8531, Japan