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Botulism can cause facial muscle paralysis and problems with breathing. The botulinum toxins are very similar in structure and function to the tetanus toxin, but differ dramatically in their clinical effects because they target different cells in the nervous system. illness which begins by causing the paralysis of the face muscles and then the paralysis of most of the body.
When the muscles which control breathing become paralyzed, this results in reparatory arrest and death.
Botulinum toxin is the most powerful neurotoxin known to date. Only one single molecule of it is needed to stop one neuron working.
Just one gram of botulinum toxin would be enough to kill 14,000 people (if ingested), 1.25 million people if inhaled, or a staggering 8.3 million people if injected.

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