Name: Williamsia deligens Yassin and Hupfer 2006

Category: Species

Proposed as: sp. nov.

Etymology: de.li.gens. L. fem. part. adj. deligens, selecting, choosing, reffering to the preference of carbon source

Gender: feminine

Type strain: CCUG 50873; DSM 44902; IMMIB RIV-956; JCM 13662

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ920290 Analyse FASTA

Valid publication: Yassin AF, Hupfer H. Williamsia deligens sp. nov., isolated from human blood. Int J Syst Evol Microbiol 2006; 56:193-197. 🇩🇪

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 56, part 1 of the IJSEM. Int J Syst Evol Microbiol 2006; 56:679-680.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Emendations:
  • Nouioui et al. 2018 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. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 29. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2019; 69:13-32.

• Notes:
  • 😷 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 4 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 a putative 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. 🇬🇧

Parent taxon: Williamsia Kämpfer et al. 1999

Assigned by: Yassin AF, Hupfer H. Williamsia deligens sp. nov., isolated from human blood. Int J Syst Evol Microbiol 2006; 56:193-197. 🇩🇪

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Record number: 783103