prevotella brevis prevotella brevis prevotella brevis is a species of bacterium. prevotella brevis scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: prevotellaceae genus: prevotella species: p. brevis binomial name prevotella brevisavgustin et al. 1997 prevotella species are part of the human oral and vaginal microbiota. 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 carotid atherosclerosis.