1. National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
2. Transboundary Animal Diseases Research Center, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kogoshima 890-0065, Japan
3. Veterinary Diagnostic Laboratory, Marupi Lifetech Co., Ltd., Fushio-cho, Ikeda, Osaka 563-0011, Japan