A 45-year old man with fever, abdominal pain, and a pulsating mass underwent an aneurysmectomy, with in situ reconstruction using a bifurcated knitted Dacron graft, for a saccular abdominal aortic aneurysm (AAA). A culture taken postoperatively grew Campylobacter fetus subspecies fetus. The administration of antibiotics sensitive to this organism was continued for 3 months, and no infection has been encountered in the 1 year since his operation. This is only the 13th documented case of AAA infected by C. fetus subspecies fetus.