Prevotella

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A genus of gramnegative, anaerobic, nonspore-forming, nonmotile rods. Organisms of this genus were originally classified as members of the Bacteroides genus but overwhelming biochemical and chemical findings in 1990 indicated the need to separate them from other Bacteroides species; hence, this new genus was established.

A genus of gram negative anaerobic bacteria previously grouped in the genus Bacteroides. Involved in periodontal disease and a cause of dog and cat bite wound infections.

• P. melaninogenica — isolated from footrot and foot abscesses of cattle. Previously called Bacteroides melaninogenicus.
• P. ruminicola — one of the predominant anaerobic gram negative bacterial species in ruminal contents.