Tetanus toxin is released in which location?

• A. In the lungs
• B. In wounds
• C. In the bloodstream
• D. In the stomach

Answer: (D)

Tetanus toxin is produced by Clostridium tetani in an anaerobic wound environment. Dirty, deep, or puncture wounds provide the low-oxygen niche the bacteria need, so they germinate there and release tetanospasmin directly into the wound tissue. From the wound, the toxin then escapes into the body’s circulation and travels to the central nervous system, where it blocks inhibitory neurotransmitters (glycine and GABA), leading to unregulated motor neuron activity and the characteristic muscle rigidity. The lungs or stomach are not sites where the toxin is released, and while the toxin can circulate in the bloodstream after release, the initial release location is the wound.