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Bacterium of the genus Clostridium.
Clostridium botulinum, like its cousin C tetani, is a soil-living, rod-shaped bacterium which can protect itself by forming spores. It causes disease by producing a toxin. C. botulinum toxin causes neuromuscular paralysis. This can be made use of therapeutically. Disease due to the toxin is loosely known as botulism.
Spores can be found in honey, which is why it is not recommended food for infants.