1. Laboratory of Parasitology, Department of Disease Control, Graduate School of Infectious Diseases, Faculty of Veterinary Medicine, Hokkaido University, Hokkaido, Japan
2. Laboratory of Microbiology and Immunology, Faculty of Pharmaceutical Sciences, Chiba Institute of Science, Chiba, Japan
3. Department of Applied Physics, Graduate School of Engineering, Tohoku University, Miyagi, Japan
4. Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan