Bacteroides fluxus is a Gram-negative anaerobic bacillus isolated from human faeces in healthy individuals. Until now, this bacterium had not been involved in human diseases. We report the first case of abdominal infection due to this microorganism in an elderly patient. A 76-year-old man with a history of chronic pulmonary obstructive disease presented with dyspnea, orthopnea and cough. The clinical evolution worsened with both a colonic ischemia and further diffuse peritonitis of pancreatic origin. Peritoneal fluid was obtained and the culture yielded B. fluxus in pure culture. Resistance to penicillin, amoxicillin-clavulanate, clindamycin and moxifloxacin was documented. Treatment with meropenem + linezolid was started, but the patient finally died due to a multiorganic failure.

Bacteroides fluxus是一种从健康个体的人类粪便中分离出来的革兰氏阴性厌氧杆菌。直到现在，这种细菌还没有与人类疾病有关。我们报告了第一例老年患者因这种微生物引起的腹部感染。一名 76 岁男性，有慢性肺阻塞病史，因呼吸困难、端坐呼吸和咳嗽就诊。随着结肠缺血和胰腺来源的进一步弥漫性腹膜炎，临床进展恶化。获得腹膜液，在纯培养中培养出B.fluxus 。记录了对青霉素、阿莫西林-克拉维酸、克林霉素和莫西沙星的耐药性。开始用美罗培南+利奈唑胺治疗，但患者最终因多器官衰竭死亡。