Name: Propionibacterium acidifaciens Downes and Wade 2009

Category: Species

Proposed as: sp. nov.

Etymology: a.ci.di.fa’ci.ens. L. neut. adj. acidum, acid; L. v. facio, to produce; N.L. neut. part. adj. acidifaciens, acid-producing

Pronunciation (Latin), gender: … a-ki-di-FA-ki-ens, neuter

Type strain: C3M_31; CCUG 57100; DSM 21887; JCM 16571

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB565481 Analyse FASTA

Valid publication: Downes J, Wade WG. Propionibacterium acidifaciens sp. nov., isolated from the human mouth. Int J Syst Evol Microbiol 2009; 59:2778-2781. 🇬🇧

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 59, part 11 of the IJSEM. Int J Syst Evol Microbiol 2010; 60:269-270.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 1

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.07826 (N = 16).
  • 😷 The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1, note = "+". — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 15 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded pathogenicity of the species itself.
  • 🧍 According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0. 🇬🇧
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪

Parent taxon: Propionibacterium Orla-Jensen 1909 (Approved Lists 1980)

Assigned by: Downes J, Wade WG. Propionibacterium acidifaciens sp. nov., isolated from the human mouth. Int J Syst Evol Microbiol 2009; 59:2778-2781. 🇬🇧

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Record number: 788210