1. Division of Infectious Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
2. Division of Zoonosis Research, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
3. Okinawa Prefectural Institute of Animal Health, Okinawa, Japan
4. Livestock Hygiene Service Center of Okinawa Prefecture, Okinawa, Japan