1. College of Veterinary Medicine, Kyungpook National University, Bukgu, Daegu 41566, Korea
2. National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
3. Animal Health Center of Zoo Land, Daejeon O-World Theme Park, Junggu, Daejeon 35073, Korea