1. Laboratory of Veterinary Microbiology I, Azabu University, Sagamihara, Kanagawa 252-5201, Japan
2. Laboratory of Small Animal Internal Medicine, Azabu University, Sagamihara, Kanagawa 252-5201, Japan
3. Department of Microbiology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0329, Japan
4. ITEA Inc., Institute of Tokyo Environmental Allergy, Bunkyo-ku, Tokyo 113-0034, Japan
5. Department of Quality Assurance, Radiation Safety, and Information Management, National Institute of Infectious Diseases, Musashimurayama, Tokyo 208-0011, Japan
6. Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan