🧠 Answer Reveal! Mini Case Challenge
The Question:
A patient presents with severe muscle stiffness after stepping on a rusty nail.
Which organism is MOST likely responsible?
The correct answer is:
✅ D) Clostridium tetani
Clostridium tetani is an anaerobic, spore-forming Gram-positive rod responsible for tetanus.
🔬 Why is this the correct answer?
C. tetani produces a powerful neurotoxin called tetanospasmin, which blocks the release of inhibitory neurotransmitters (GABA and glycine).
This results in:
💪 Severe muscle stiffness and painful spasms
😬 Lockjaw (trismus)
⚡ Sustained muscle contractions, also known as spastic paralysis
💡 Important to Remember:
Rust itself does NOT cause tetanus!
The concern is that a puncture wound may introduce C. tetani spores from contaminated soil, dust, or other environmental sources.
🧠 Pattern to Remember
📌 Puncture wound
➕ Anaerobic spore-forming GPR
➕ Tetanospasmin
➕ Muscle stiffness / spasms
= Clostridium tetani
🔬 Quick ASCP Tip:
C. tetani → Spastic paralysis (muscle stiffness)
C. botulinum → Flaccid paralysis (muscle weakness)
👏 If you selected D, you got it right! 🎉
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🧠 Answer Reveal! Mini Case Challenge
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