Veillonella are gram-negative anaerobic cocci. This bacterium is well known for its lactate fermenting abilities. They are a normal bacterium in the intestines and oral mucosa of mammals. In humans they have been rarely implicated in cases of osteomyelitis and endocarditis, for example with the species Veillonella parvula.
Lactate → acetate + 2 propionate + CO2 + H2O
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)  and National Center for Biotechnology Information (NCBI) and the phylogeny is based on 16S rRNA-based LTP release 106 by The All-Species Living Tree Project 
- J.P. Euzéby. "Veillonella". List of Prokaryotic names with Standing in Nomenclature (LPSN) . http://www.bacterio.cict.fr/classifphyla.html#Firmicutes. Retrieved 2011-11-17.
- Sayers et al.. "Veillonella". National Center for Biotechnology Information (NCBI) taxonomy database . http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Undef&id=909932&lvl=6&lin. Retrieved 2011-06-05.
- All-Species Living Tree Project."16S rRNA-based LTP release 106 (full tree)". Silva Comprehensive Ribosomal RNA Database . http://www.arb-silva.de/fileadmin/silva_databases/living_tree/LTP_release_106/LTPs106_SSU_tree.pdf. Retrieved 2011-11-17.
- Brook I (May 1996). "Veillonella infections in children". J. Clin. Microbiol. 34 (5): 1283–5. PMC 228999. PMID 8727920. http://jcm.asm.org/cgi/pmidlookup?view=long&pmid=8727920.
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