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16S rRNA RefSeq: V15.22    Genomic RefSeq: V9.15
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Leptotrichia buccalis (HMT-563)
Taxon Description:
Leptotrichia buccalis is a common oral bacteria. Previously all human oral Leptotrichia isolates were lumped into the single species L. buccalis. From 16S rRNA studies we now recognize that there are approximately 20 Leptotrichia species five of which been named [2]. The early literature was confused as two organisms were called Leptotrichia buccalis [1].

Disease Associations:
Leptotrichia buccalis is not commonly pathogenic but has on rare occasions been associated with bacteraemia and endocarditis particularly in neutropenic patients [3]. It has been endodontic leasions by checkerboard hybridization [4].

Prevalence and Source:
Commonly found in dental plaque.
species/Leptotrichia_256x256.png Leptotrichia (cyan) in a hedgehog structure in human dental plaque, together with Corynebacterium (magenta) and Streptococcus (green).
See Mark Welch et al. 2016

Class: Fusobacteriia
Order: Fusobacteriales
Genus: Leptotrichia
Species:Leptotrichia buccalis
Status: Named - Cultured
Type/Reference Strain: ATCC 14201
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Former Names or Synonyms:
Leptothrix buccalis
16S rRNA Reference Sequences:    view in
RefSeq tree
RefSeq ID: 563_7788

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Genotypic Description:
Phenotypic Characteristics: Straight or slightly curved rods. Cells 0.8-1.5 um wide and 5-15 um long. Cells frequently arranged in chains or septate filaments. Gram-negative but may be Gram-positive in young cultures. Ferments glucose and several other sugars to lactic acid.
Cultivability: Leptotrichia buccalis requires anaerobic culture for initial isolation. Some strains are reported to grow aerobically in the presence of CO2 on subsequent passage.
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Microbial Ecology
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NCBI Taxon ID: 40542 [Link to NCBI]
PubMed Searches:
[NCBI PubMed Link]
[NCBI (Entrez) Nucleotide Link]
[NCBI (Entrez) Protein Link]
Number of
Genome Sequences:
1 See List
Phylogenetic Trees:
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[1] Eribe ER, Paster BJ, Caugant DA, Dewhirst FE, Stromberg VK, Lacy GH, Olsen I. Genetic diversity of Leptotrichia and description of Leptotrichia goodfellowii sp. nov., Leptotrichia hofstadii sp. nov., Leptotrichia shahii sp. nov. and Leptotrichia wadei sp. nov. Int J Syst Evol Microbiol. 2004 Mar;54(Pt 2):583-92
[2] Sassone L, Fidel R, Figueiredo L, Fidel S, Faveri M, Feres M. Evaluation of the microbiota of primary endodontic infections using checkerboard DNA-DNA hybridization. Oral Microbiol Immunol. 2007 Dec;22(6):390-7
[3] Ulstrup AK, Hartzen SH. Leptotrichia buccalis: a rare cause of bacteraemia in non-neutropenic patients. Scand J Infect Dis. 2006;38(8):712-6
[4] GILMOUR MN, HOWELL A Jr, BIBBY BG. The classification of organisms termed Leptotrichia (Leptothrix) buccalis. I. Review of the literature and proposed separation into Leptotrichia buccalis Trevisan, 1879 and Bacterionema gen. nov., B. Bacteriol Rev. 1961 Jun;25:131-41