1. Veterinary Laboratory Medicine, Joint Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, 101 Minami 4-chome, Koyama-cho, Tottori-shi, Tottori 680-8550, Japan
2. Veterinary Diagnostic Laboratory, Marupi: Lifetech Co., Ltd., 103 Fushio-cho, Ikeda, Osaka 563-0011, Japan
3. National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan