Yohei Mikami1)/Ho Namkoong2)/Akihiko Yoshimura3)/Koichi Fukunaga2)/Takanori Kanai1):Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine 1)/Division of Pulmonary Medicine, Department of Internal Medicine, Keio University School of Medicine2)/Department of Microbiology and Immunology, Keio University School of Medicine3)(慶應義塾大学医学部 消化器内科1)/慶應義塾大学医学部内科学 呼吸器内科2)/慶應義塾大学医学部 微生物学免疫学教室3))