🧠 Answer Reveal! Recall Question
The Question:
Which Clostridium species is classically associated with double-zone hemolysis on blood agar?
The correct answer is:
✅ C) Clostridium perfringens
Clostridium perfringens is known for producing a characteristic double zone of hemolysis on blood agar.
🔬 What does this look like?
🔴 Inner zone: Complete beta-hemolysis, primarily associated with theta toxin (perfringolysin O).
🟡 Outer zone: Partial hemolysis, associated with alpha toxin (lecithinase).
💡 Why is this important?
This distinctive hemolytic pattern is a useful laboratory clue when identifying C. perfringens, an anaerobic, spore-forming Gram-positive rod.
However, the hemolysis pattern alone does not provide a definitive identification.
🧠 Pattern to Remember
🧫 Blood agar
➕ Double-zone hemolysis
➕ Anaerobic Gram-positive rod
➕ Alpha and theta toxins
= Think Clostridium perfringens!
👏 If you selected C, you got it right! 🎉
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🧠 Answer Reveal! Recall Question
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