Minute (0.3 Mm) anaerobic Gram-negative cocci occurring in masses. Commensals of the human mouth, alimentary tract etc., they may occasionally assume a pathogenic role.
A genus of gram-negative, anaerobic diplococci that inhabit the oral cavity and gastrointestinal tract. Although Veillonella species rarely cause human disease, occasional episodes of bone or blood-borne infection have been reported.