Botulism can cause respiratory failure due to what mechanism?

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Botulism causes respiratory failure because the toxin blocks acetylcholine release at the neuromuscular junction, leading to flaccid paralysis of the skeletal muscles. This effect is due to the toxin cleaving SNARE proteins that are essential for neurotransmitter release, so the nerves cannot stimulate the muscles. As the paralysis spreads, the diaphragm and other breathing muscles weaken, making it impossible to breathe effectively. That neuromuscular blockade is the reason for respiratory failure, not diarrhea, kidney problems, or a non-respiratory course. The danger is ongoing weakness of the breathing muscles, which is why airway support and antitoxin are critical components of care.