The Most common cause of a Mycotic aneurysm is
Primary infection of the aoic wall results in aneurysm formation termed mycotic aneurysms, the pathogens usually are bacteria, most common being Staphylococcus aureus, Staphylococcus epidermidis, Salmonella, and Streptococcus. ref - Harrisons internal medicine 20e pg1918
Candida albicans
Treponema pallidum
Staphylococcus aureus
Pseudomonas aeuriginosa
C.V.S