Name: Weeksella virosa Holmes et al. 1987

Category: Species

Proposed as: sp. nov.

Etymology: vi.ro’sa. L. fem. adj. virosa, slimy

Gender: feminine

Type strain: ATCC 43766; CCUG 30538; CIP 103040; DSM 16922; IFO 16016; JCM 21250; LMG 12995; NBRC 16016; NCTC 11634

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M93152 Analyse FASTA

Effective publication: Holmes B, Steigerwalt AG, Weaver RE, Brenner DJ. Weeksella virosa gen. nov., sp. nov. (formerly group IIF) found in human clinical specimens. Syst. Appl. Microbiol. 1986; 8:185-190.

IJSEM list: Anonymous. Validation list no. 23. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1987; 37:179-180.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Emendations:
  • Zhang et al. 2014 Zhang RG, Tan X, Zhao XM, Deng J, Lv J. Moheibacter sediminis gen. nov., sp. nov., a member of the family Flavobacteriaceae isolated from sediment, and emended descriptions of Empedobacter brevis, Wautersiella falsenii and Weeksella virosa. Int J Syst Evol Microbiol 2014; 64:1481-1487. Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 64, part 5 of the IJSEM. Int J Syst Evol Microbiol 2014; 64:2509-2511.
    Notes:
    • The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. Using the term "phylogenetic data" (or equivalent) for sequence data is not advocated. Whether taxa can have "members" is debatable. See the LPSN phylogeny page for details.
  • Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.

• Notes:
  • Nomenclatural type of the genus Weeksella Holmes et al. 1987. Publication: Holmes B, Steigerwalt AG, Weaver RE, Brenner DJ. Weeksella virosa gen. nov., sp. nov. (formerly group IIF) found in human clinical specimens. Syst. Appl. Microbiol. 1986; 8:185-190.
  • 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 2022; 168:0.
  • The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Lang E, Teshima H, Lucas S, Lapidus A, Hammon N, Deshpande S, Nolan M, Cheng JF, Pitluck S, Liolios K, et al. Complete genome sequence of Weeksella virosa type strain (9751). Stand Genomic Sci 2011; 4:81-90.
  • The full TRBA 466 classification is: risk group = 1, note = "+".

Parent taxon: Weeksella Holmes et al. 1987

Assigned by: Holmes B, Steigerwalt AG, Weaver RE, Brenner DJ. Weeksella virosa gen. nov., sp. nov. (formerly group IIF) found in human clinical specimens. Syst. Appl. Microbiol. 1986; 8:185-190.

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Record number: 783088