What are the causes of a bacterial aneurysm?

Bacteria. May follow bacterial endocarditis and sepsis with bacteremia and localized distant site or a known aneurysm may become infected by bacteremia or extension to GI tract as aortoenteric fistula usually called mycotic-infected aneurysm any bacteria can be involved staph, and some gram negatives are more common-like e coli several fungi have historically been involved.