A 42–year–old man comes to the emergency department because of sudden-onset diarrhea and nausea directly following a fish barbeque at the beach. The next day, he cannot lift his left hand. Examination shows a wrist drop in the left hand. His pulse is 56/mm. However, his pupils are normal and there is no difficulty in eating. Which of the following is the treatment for this condition?

**Core Concept**
The patient is presenting with symptoms of sudden-onset diarrhea, nausea, wrist drop, and bradycardia following a fish barbecue. This classic presentation is suggestive of **Tetanus infection**, a neurotoxin-mediated disease caused by Clostridium tetani.

**Why the Correct Answer is Right**
Tetanus infection occurs when spores of C. tetani are introduced into the body through a wound, where they produce the neurotoxin tetanospasmin. This toxin blocks the release of neurotransmitters, leading to muscle rigidity, spasms, and autonomic dysfunction, including bradycardia. The patient's symptoms, including the wrist drop, are characteristic of tetanus infection. The normal pupils and absence of difficulty in eating suggest that the patient's cranial nerves are not affected, which is consistent with tetanus infection.

**Why Each Wrong Option is Incorrect**
**Option B:** This option is likely referring to botulinum toxin, which causes a different type of neurotoxic illness. Botulism would present with cranial nerve dysfunction, including difficulty in eating, which is not seen in this patient.

**Option C:** This option is incorrect because antivenom is used to treat snake bites, not tetanus infection.

**Option D:** This option is incorrect because antibiotics may be used to treat the underlying wound infection, but they are not the primary treatment for tetanus infection.

**Clinical Pearl / High-Yield Fact**
Tetanus infection can be prevented by vaccination, which is usually given as part of the DTaP (diphtheria, tetanus, and pertussis) vaccine. Booster shots are recommended every 10 years to maintain immunity.

**Correct Answer:** C. Antitoxin (Tetanus Immunoglobulin) should be administered as soon as possible, along with wound care and supportive measures.

✓ Correct Answer: B. Conservative only