Gas gangrene is most commonly caused by which organism?

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Multiple Choice

Gas gangrene is most commonly caused by which organism?

Gas gangrene is caused by an anaerobic infection of damaged tissue that produces gas as it grows. The organism most commonly responsible is Clostridium perfringens, a spore-forming anaerobe that thrives in low-oxygen conditions found in devitalized tissue. It releases potent toxins, especially the alpha toxin, which damages cell membranes and drives rapid muscle necrosis, so the tissue fills with gas from fermentation. That combination of toxic myonecrosis and gas production is why this organism is the classic cause of gas gangrene. The other organisms listed are linked to different clinical pictures—Staphylococcus aureus with general wound or skin infections, Listeria with meningitis or sepsis in certain groups, and Bacillus cereus with food poisoning—so they don’t fit the typical gas gangrene scenario.

Gas gangrene is caused by an anaerobic infection of damaged tissue that produces gas as it grows. The organism most commonly responsible is Clostridium perfringens, a spore-forming anaerobe that thrives in low-oxygen conditions found in devitalized tissue. It releases potent toxins, especially the alpha toxin, which damages cell membranes and drives rapid muscle necrosis, so the tissue fills with gas from fermentation. That combination of toxic myonecrosis and gas production is why this organism is the classic cause of gas gangrene. The other organisms listed are linked to different clinical pictures—Staphylococcus aureus with general wound or skin infections, Listeria with meningitis or sepsis in certain groups, and Bacillus cereus with food poisoning—so they don’t fit the typical gas gangrene scenario.

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