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Botulism (cont.)

How many kinds of botulism are there?

There are three main kinds of botulism, which are categorized by the way in which the disease is acquired:

  • Food-borne botulism is caused by eating foods that contain the botulinum neurotoxin.


  • Wound botulism is caused by neurotoxin produced from a wound that is infected with the bacteria Clostridium botulinum.


  • Infant botulism occurs when an infant consumes the spores of the botulinum bacteria. The bacteria then grow in the intestines and release the neurotoxin.

Three other kinds of botulism have been described but are seen rarely. The first is adult intestinal colonization that is seen in older children and adults with abnormal bowels. Only rarely does intestinal infection with the Clostridium botulinum bacteria occur in adults. Typically, the adult form of this intestinal botulism is related to abdominal surgical procedures. The second kind (injection botulism) is seen in patients injected with inappropriately high amounts of therapeutic neurotoxin (for example, BOTOX, Dysport, Myobloc), while the third kind (inhalation botulism) has occurred in laboratory personnel who work with the neurotoxins. All six kinds of botulism are potentially fatal.

How serious is botulism?

Botulinum neurotoxin is considered one of the most potent, lethal substances known. As little as about 1 nanogram/kg can be lethal to an individual, and scientists have estimated that about 1 gram could potentially kill 1 million people. This small amount of toxin capable of killing humans has made the toxin a candidate for use in weapons for biowarfare and bioterrorism. All forms of botulism can be fatal and are considered medical emergencies. Food-borne botulism can be especially dangerous because many people can be poisoned by eating even small amounts of neurotoxin-contaminated food. A botulism outbreak is a public-health emergency that is reportable to the U.S. government.



Next: How does botulism neurotoxin affect the body? »

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