1. Division of Clinical Laboratory, Sanritsu Zelkova Veterinary Laboratory, 3-5-5 Ogibashi, Koto-ku, Tokyo 135-0011, Japan
2. Division of Clinical Laboratory, Sanritsu Laboratory, 1353-25 Kamitakano, Yachio, Chiba 276-0022, Japan
3. Laboratory of Infectious Diseases, Graduate School of Infection Control Sciences & Ōmura Satoshi Memorial Institute, Kitasato University, Shirokane, Minato-ku, Tokyo 108-8641, Japan