1. Veterinary Teaching Hospital, Azabu University, Sagamihara, Kanagawa, Japan
2. Laboratory of Veterinary Microbiology I, Department of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa, Japan
3. Den-en-chofu Animal Hospital, Ota-ku, Tokyo, Japan
4. Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
5. Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
6. Field Science Center, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
7. Research Institute of Biosciences, Azabu University, Sagamihara, Kanagawa, Japan