Botulism intoxication — toxin type: The clinical illness of botulism results from ingestion of which class of toxin produced by Clostridium botulinum?

Introduction / Context:
Botulism presents with neurologic signs such as diplopia, dysphagia, flaccid paralysis, and in severe cases respiratory failure. The mechanism is a neuroparalytic toxin blocking neuromuscular transmission.

Given Data / Assumptions:

• Agent: Clostridium botulinum.
• Toxin: protein neurotoxin types A–G.
• Exposure: preformed toxin in foods or in vivo production in wound/infant botulism.

Concept / Approach:
The botulinum neurotoxin cleaves SNARE proteins in cholinergic nerve terminals, preventing acetylcholine release and causing flaccid paralysis. It is not an enterotoxin or a fungal mycotoxin.

Step-by-Step Solution:
Identify hallmark: neuroparalysis.Match to toxin class: neurotoxin.Select ‘‘Neurotoxin.’’

Verification / Alternative check:
Clinical antitoxin therapy targets circulating neurotoxin, confirming the mechanism.

Why Other Options Are Wrong:

• Enterotoxin: would primarily cause secretory diarrhea, not paralysis.
• Mycotoxin: produced by fungi, not Clostridium.
• All of these: overinclusive and incorrect.

Common Pitfalls:
Assuming gastrointestinal symptoms are predominant; neurological findings are diagnostic.

Final Answer:
Neurotoxin