Which organisms are commonly implicated in the etiology of subpectoral abscess?

Which organisms are commonly implicated in the etiology of subpectoral abscess?

• A. Hemolytic streptococci, Staph aureus
• B. Escherichia coli and Klebsiella
• C. Pseudomonas aeruginosa only
• D. Mycobacterium tuberculosis

Answer: (A)

Subpectoral abscesses most often arise from skin/soft-tissue flora that colonize the chest area. Staphylococcus aureus is the leading cause of soft tissue infections in this region, and beta-hemolytic (hemolytic) streptococci frequently accompany it in breast and chest wall infections. These organisms are common in breakdown of skin or postoperative sites and readily form localized pus beneath the pectoralis muscle. By contrast, enteric bacteria like E. coli and Klebsiella come from the gastrointestinal tract and are less typical culprits for breast/subpectoral abscesses. Pseudomonas is more associated with nosocomial infections, implanted devices, or burn wounds, and Mycobacterium tuberculosis causes a much rarer, chronic breast infection.

Subpectoral abscesses most often arise from skin/soft-tissue flora that colonize the chest area. Staphylococcus aureus is the leading cause of soft tissue infections in this region, and beta-hemolytic (hemolytic) streptococci frequently accompany it in breast and chest wall infections. These organisms are common in breakdown of skin or postoperative sites and readily form localized pus beneath the pectoralis muscle. By contrast, enteric bacteria like E. coli and Klebsiella come from the gastrointestinal tract and are less typical culprits for breast/subpectoral abscesses. Pseudomonas is more associated with nosocomial infections, implanted devices, or burn wounds, and Mycobacterium tuberculosis causes a much rarer, chronic breast infection.