Campylobacter fetus infection of abdominal aortic aneurysm. A 61-year-old man with Campylobacter fetus infection of an abdominal aortic aneurysm treated surgically is presented herein, the fifth survival case reported in the literature. Fever and back pain preceded the enlargement of atherosclerotic abdominal aortic aneurysm. The patient tolerated satisfactorily total excision of the aneurysm followed by axillo-femoral prosthetic bypass. Antibiotic therapy consisted of intravenous infusion of fosfomycin and gentamicin and oral administration of minocycline. The organism cultured from the aneurysmal wall and intraluminal thrombi was identified as Campylobacter fetus from its typical characteristics. It is concluded that this organism should be considered in all cases of infected aneurysm in elderly or debilitated patients. 