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A rare case of an abdominal aortic aneurysm (AAA) infected by Listeria monocytogenes in a 72-year-old male diabetic farmer, is reported. Our patient had a history of a recent pneumonia that could have been caused by Listeria too. Aneurysm infection was manifested by fever and abdominal and back pain, which prompted investigation with CT scanning that revealed a 4.9 cm AAA with typical signs of infection. He underwent urgent AAA repair with aortobifemoral bypass grafting and had an uneventful course. Aneurysm content microbiology revealed Listeria monocytogenes and following a 9-week course of antibiotics our patient remains asymptomatic 11 months later.