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In page Botulism:

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Wound botulism results from the contamination of a wound with the bacteria, which then secrete the toxin into the bloodstream. This has become more common in intravenous drug users since the 1990s, especially people using black tar heroin and those injecting heroin into the skin rather than the veins.[1] Wound botulism can also come from a minor wound that is not properly cleaned out; the skin grows over the wound thus trapping the spore in an anaerobic environment and creating botulism. One example was a person who cut their ankle while using a weed eater; as the wound healed over, it trapped a blade of grass and spec of soil under the skin that lead to severe botulism requiring hospitalization and rehabilitation for months. Wound botulism accounts for 29% of cases.[citation needed]