1. Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba 274-8510, Japan
2. Laboratory of Parasitology, Department of Disease Control, Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku Sapporo, Hokkaido 060-0818, Japan
3. Laboratory of Parasitology, Faculty of Veterinary Medicine, Okayama University of Science, 1-3 Ikoinooka, Imabari-shi, Ehime 794-8555, Japan
4. Laboratory of Wildlife Resources, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1303, Japan
5. Kumamoto Prefectural Aso Public Health Center, 2402 Miyaji, Ichinomiya-machi, Aso-shi, Kumamoto 869-2612, Japan
6. Joint Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan