A genus of bacteria containing gram-negative, non-spore-forming, nonmotile, obligately anaerobic rods that produce butyric acid as a major metabolic product. These organisms are found in cavities of humans and other animals; some species are pathogenic. The type species is Fusobacterium nucleatum.
[L. fusus, a spindle, + bacterium]
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Examples: glitazone, GI cocktail, etc.