Bacteriology of aortic aneurysm sac contents.

Aerobic and anaerobic cultures from the intraluminal thrombus of infrarenal aortic aneurysms were obtained from 239 patients. Culture results were related to the mode of presentation and the incidence of graft infection. Positive cultures were obtained from 27 patients (11.3%). No statistical correlation between the result of thrombus culture and the mode of presentation was found.