1. *Department of Immunology and Medical Zoology, Faculty of Medicine, Fukui Medical University, Yoshida-gun, Fukui, Japan;
2. †Department of Bacterial and Blood Products, National Institute of Infectious Diseases, Musashimurayamashi, Tokyo, Japan; and
3. ‡Department of Hematology and Clinical Immunology, Kobe City General Hospital, Kobe, Japan.