What is the key feature of botulism?

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Multiple Choice

What is the key feature of botulism?

Botulism produces a descending, flaccid weakness because the toxin blocks acetylcholine release at the neuromuscular junction. This leads to weakness that starts with the cranial nerves (vision, swallowing, speaking) and then moves downward, while sensation remains intact. Fever is not a feature, and the presentation is motor-only, with no sensory loss. That’s why the statement describing descending, flaccid paralysis without fever matches botulism best. The other patterns don’t fit: a rising, sensory-preserving weakness with fever would point away from botulism and toward other causes; a spastic (stiff, UMN-type) paralysis suggests central involvement; and paralysis with sensory loss implies nerve or spinal cord pathology rather than a toxin blocking NMJ transmission.

Botulism produces a descending, flaccid weakness because the toxin blocks acetylcholine release at the neuromuscular junction. This leads to weakness that starts with the cranial nerves (vision, swallowing, speaking) and then moves downward, while sensation remains intact. Fever is not a feature, and the presentation is motor-only, with no sensory loss.

That’s why the statement describing descending, flaccid paralysis without fever matches botulism best. The other patterns don’t fit: a rising, sensory-preserving weakness with fever would point away from botulism and toward other causes; a spastic (stiff, UMN-type) paralysis suggests central involvement; and paralysis with sensory loss implies nerve or spinal cord pathology rather than a toxin blocking NMJ transmission.

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