Name: Propionibacterium acnes subsp. elongatum Dekio et al. 2015

Category: Subspecies

Proposed as: subsp. nov.

Etymology: e.lon.ga’tum. L. neut. part. adj. elongatum, elongated, named after the characteristic cell shape

Pronunciation, gender: e-lon-GA-tum, neuter

Type strain: JCM 18919; K124; NCTC 13655

Conduct genome-based taxonomy at

16S rRNA gene: AB777861 Analyse FASTA

Valid publication: Dekio I, Culak R, Misra R, Gaulton T, Fang M, Sakamoto M, Ohkuma M, Oshima K, Hattori M, Klenk HP, et al. Dissecting the taxonomic heterogeneity within Propionibacterium acnes: proposal for Propionibacterium acnes subsp. acnes subsp. nov. and Propionibacterium acnes subsp. elongatum subsp. nov. Int J Syst Evol Microbiol 2015; 65:4776-4787.

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 65, part 12 of the IJSEM. Int J Syst Evol Microbiol 2016; 66:1600-1602.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Cutibacterium acnes subsp. elongatum (Dekio et al. 2015) Dekio et al. 2019

Risk group: 1

• Synonyms:

  • Name	Kind
    Propionibacterium acnes subsp. elongatum McDowell et al. 2016	homotypic synonym, validly published under the ICNP, illegitimate name
    Cutibacterium acnes subsp. elongatum (Dekio et al. 2015) Dekio et al. 2019	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Propionibacterium acnes subsp. elongatum is the correct name instead if this subspecies is regarded as a separate subspecies (i.e., if its nomenclatural type is not assigned to another subspecies whose name is validly published, legitimate and not rejected and has priority) within a separate species Propionibacterium acnes within a separate genus Propionibacterium.
  • 😷 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.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this subspecies. The name is on LoRN because of the recorded pathogenicity of the species itself.

Parent taxon: Propionibacterium acnes (Gilchrist 1900) Douglas and Gunter 1946 (Approved Lists 1980)

Assigned by: Dekio I, Culak R, Misra R, Gaulton T, Fang M, Sakamoto M, Ohkuma M, Oshima K, Hattori M, Klenk HP, et al. Dissecting the taxonomic heterogeneity within Propionibacterium acnes: proposal for Propionibacterium acnes subsp. acnes subsp. nov. and Propionibacterium acnes subsp. elongatum subsp. nov. Int J Syst Evol Microbiol 2015; 65:4776-4787.

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Record number: 793571