ACUTE FOCAL SUPPURATIVE INFECTIONS Brain abscess a) may arise from a variety of routes (see slides # 1 and 2 for details) i) often from primary infected site in the heart (acute bacterial endocarditis), lungs, tooth decay, bones b) Strep and Staph are the most common bacteria c) cerebral abscesses are destructive lesions www.freelivedoctor.com 10.