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A family of nonmotile, nonsporeforming, anaerobic bacteria (order Eubacteriales) containing gram-negative (with a tendency to resist decolorization) cocci that vary in diameter from small (0.3-0.5 mcm) to large (2.5 mcm). Characteristically, they occur in pairs; single cells, masses, or chains may also occur, but the chains may show gaps illustrating the basic diplococcal arrangement. These organisms are chemoorganotrophic; they may or may not ferment carbohydrates; they are parasites of homothermic animals such as humans, ruminants, rodents, and pigs, and are primarily found in the alimentary tract. The type genus is Veillonella.


Adrien, French bacteriologist, 1864-1931.
Veillonella - a genus of nonmotile, non--spore-forming, anaerobic bacteria.
subsp.Veillonella alcalescensalcalescens - a bacterial subspecies found primarily in the mouths of humans but occasionally in the buccal cavity of rabbits and rats.
subsp.Veillonella alcalescensdispar - a subspecies found in the mouths and respiratory tracts of humans.
Veillonella atypica - Synonym(s): Veillonella parvula subsp. atypica
Veillonella parvula - a bacterial species found normally as a harmless parasite in the natural cavities, especially the mouths and digestive tracts of humans and other animals.
subsp.Veillonella parvulaatypia - a bacterial subspecies found in the buccal cavity of rats and humans. Synonym(s): Veillonella atypica
subsp.Veillonella parvulaparvula - a bacterial subspecies found in the mouth, or intestinal or respiratory tract of humans.
subsp.Veillonella parvularodentium - a bacterial subspecies found in the buccal cavity and intestinal tract of hamsters, rats, and rabbits. Synonym(s): Veillonella rodentium
Veillonella rodentium - Synonym(s): Veillonella parvula subsp. rodentium
Veillonellaceae - a family of nonmotile, non--spore-forming, anaerobic bacteria containing gram-negative cocci.
References in periodicals archive ?
The healthy oral cavity is characterized by a microflora dominatedbyphylumFirmicutes (genus Streptococcus, family Veillonellaceae, genus Granulicatella), Proteobacteria (genus Neisseria, Haemophilus), Actinobacteria (genus Corynebacterium, Rothia, Actinomyces), Bacteroidetes (genus Prevotella, Capnocytophaga, Porphyromona) and Fusobacteria (genus Fusobacterium).
arrow] Bacilli class: [up Prevotellaceae was arrow] Streptococcaceae enriched in alcoholic family: Clostridia class: cirrhosis patients when [up arrow] Veillonellaceae compared with HBV and [down arrow] cirrhosis patients and Lachrtospiraceae family healthy controls.
Of these 15 genera, a total of 11 genera, including Prevotella, unclassified Lachnospiraceae, Ruminococcus, unclassified Ruminococcaceae, CF231, unclassified RFP 12, unclassified Clostridiaceae, Clostridium, Oscillospira, unclassified Veillonellaceae, and Coprococcus, have been reported to dominate the yaks rumen using lUumina MiSeq sequencing method (Majorbio Bio-Pharm Technology Co.