Paratractidigestivibacter faecalis

Paratractidigestivibacter faecalis
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Actinomycetota
Class:	Coriobacteriia
Order:	Coriobacteriales
Family:	Atopobiaceae
Genus:	Paratractidigestivibacter
Species:	P. faecalis
Binomial name
	Paratractidigestivibacter faecalis; (Han et al. 2019) Zgheib et al. 2021
Type strain
	JCM 32256; DSM 103684
Synonyms
	Olsenella faecalis Han et al. 2019

Last updated July 17, 2025

Paratractidigestivibacter faecalis is a Gram-positive and strictly anaerobic bacterium in the in the genus Paratractidigestivibacter and family Atopobiaceae. It was first described as Olsenella faecalis in 2019 after isolation from a human fecal sample in South Korea.^[1] It has also been isolated from the feces of pigs in Canada.^[2]

Taxonomy

Comparative genomic and phylogenetic data showed strain JCM 32256 forms a distinct lineage within Atopobiaceae; therefore, Zgheib et al. established the genus Paratractidigestivibacter and the new combination P. faecalis.

Morphology and physiology

Cells are rod-shaped, non-motile, non-spore-forming and strictly anaerobic. Colonies on reinforced clostridial agar are round and cream-coloured. Optimal growth occurs at 37 °C and pH 7.0.

Etymology

faecalis – Latin genitive adjective "of faeces", indicating the source.
Paratractidigestivibacter – from Greek para- "beside", Latin tractus digestivus "digestive tract", and Neo-Latin bacter "rod."

References

↑ Han, K.-I.; Lee, K.-C.; Eom, M.-K.; Kim, J.-S. (August 2019). "Olsenella faecalis sp. nov., an anaerobic actinobacterium isolated from human faeces". International Journal of Systematic and Evolutionary Microbiology. 69 (8): 2323–2328. doi:10.1099/ijsem.0.003469. PMID 31135332.
↑ Rahman, N.; McCullough, T.; Orozco, D. F.; Walkowiak, S.; Farzan, A.; Shekarriz, S.; Surette, M. G.; Cicek, N.; Derakhshani, H. (18 June 2025). "Genomic characterization of antimicrobial resistance and mobile genetic elements in swine gut bacteria isolated from a Canadian research farm". Animal Microbiome. 7 (1): 66. doi: 10.1186/s42523-025-00432-w . PMC 12175345 . PMID 40533851.
↑ Zgheib, R. (May 2021). "New human-associated species of the family Atopobiaceae and proposal to reclassify members of the genus Olsenella". International Journal of Systematic and Evolutionary Microbiology. 71 (5) 004819. doi:10.1099/ijsem.0.004819. PMID 34047688.

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[Han2019-1] Han, K.-I.; Lee, K.-C.; Eom, M.-K.; Kim, J.-S. (August 2019). "Olsenella faecalis sp. nov., an anaerobic actinobacterium isolated from human faeces". International Journal of Systematic and Evolutionary Microbiology. 69 (8): 2323–2328. doi:10.1099/ijsem.0.003469. PMID 31135332.

[Rahman2025-2] Rahman, N.; McCullough, T.; Orozco, D. F.; Walkowiak, S.; Farzan, A.; Shekarriz, S.; Surette, M. G.; Cicek, N.; Derakhshani, H. (18 June 2025). "Genomic characterization of antimicrobial resistance and mobile genetic elements in swine gut bacteria isolated from a Canadian research farm". Animal Microbiome. 7 (1): 66. doi: 10.1186/s42523-025-00432-w . PMC 12175345 . PMID 40533851.

[Zgheib2021-3] Zgheib, R. (May 2021). "New human-associated species of the family Atopobiaceae and proposal to reclassify members of the genus Olsenella". International Journal of Systematic and Evolutionary Microbiology. 71 (5) 004819. doi:10.1099/ijsem.0.004819. PMID 34047688.

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