耶氏菌是革兰氏阴性球杆菌,系需氧或兼性厌氧菌,可存活于4～37℃环境中。人大多经口而获得感染。一般认为,三分之二患者呈消化道感染,即小肠结肠炎,以儿童居多。该菌尚可引致末端迥肠炎、肠系膜淋巴结炎或阑尾炎,临床表现酷似急腹症,此外也可引致结节红斑和感染后关节炎,以成人多见。上述表现大多呈良性经过。近10年来, Yersinia is a gram-negative cocci, Department of aerobic or facultative anaerobic bacteria, can survive in 4 ~ 37 ℃ environment. Most people get infected by mouth. Generally believed that two-thirds of patients were gastrointestinal infections, enterocolitis, mostly children. The bacteria can still cause terminal cystitis, mesenteric lymphadenitis or appendicitis, clinical manifestations resemble acute abdomen, in addition can also cause erythema nodosum and post-infection arthritis, more common in adults. Most of the above performance was benign. In the past 10 years,