Gas Gangrene Incidence: Prevalence and Risk Factors

Gas gangrene (clostridial myonecrosis) is rare. In the US, incidence is 1–2 cases per 100,000 person-years. Higher rates occur in specific settings:

Risk Factors

• Trauma: Crush injuries, open fractures, war wounds (soil contamination).
• Surgery: Especially colorectal, biliary, or contaminated procedures.
• Immunocompromise: Diabetes, malignancy, chemotherapy, steroids, HIV.
• Vascular disease: Peripheral arterial disease reduces tissue oxygenation, favoring anaerobic Clostridium growth.
• Injection drug use: Contaminated heroin ("black tar") with C. perfringens spores.

Clinical Urgency

Rapid progression: severe pain, crepitus, bronze/brown discharge, hemolysis, shock, death within hours if untreated. Requires emergent surgical debridement + high-dose penicillin + clindamycin + hyperbaric oxygen. Early recognition saves lives and limbs.