To identify a microorganism to cause the development of primary sclerosing cholangitis associated with ulcerative colitis.SOLUTION: The present invention provides Klebsiella pneumoniae strain that induces inflammation in the liver.SELECTED DRAWING: None【課題】潰瘍性大腸炎に伴う原発性硬化性胆管炎の発症の原因となる微生物の特定。【解決手段】肝臓で炎症を誘導する、Klebsiella pneumoniae菌株。【選択図】なし