Yokohama City University - Department of Microbiology, Yokohama City University - Department of Microbiology, Yokohama City University - Department of Microbiology, Yokohama City University - Department of Pathology, Yokohama City University - Department of Microbiology, Kanto Chemical Co., Inc. - Life Science Laboratory, Yokohama City Institute of Public Health, Yokohama City Institute of Public Health, Yokohama City Institute of Public Health, Yokohama City University - Department of Microbiology, Yokohama Municipal Citizen's Hospital - Division of Pathology, Yokohama City University - Department of Pathology, Kanto Chemical Co., Inc. - Life Science Laboratory, Kanto Chemical Co., Inc. - Life Science Laboratory, Yokohama Municipal Citizen's Hospital - Division of Infectious Disease, Yokohama City University - Department of Physiology, Yokohama City University - Clinical Laboratory Department, National Institute of Infectious Diseases - Department of Pathology, Gunma Paz University - School of Medical Technology, Faculty of Health Sciences, National Institute of Infectious Diseases - Department of Pathology and Yokohama City University - Department of Microbiology