Prevotella bryantii

Prevotella bryantii, previously known as Bacteroides ruminicola ruminicola subsp. brevis biovar 3, is a species of bacterium.

Prevotella species are part of the human oral and vaginal flora. They play a role in the pathogenesis of periodontal disease, gingivitis, extraoral and some odontogenic infections, and strains are usually carried in families, in so-called intrafamilial carriage. It is also associated with carothid atherosclerosis.