Name: Citrobacter youngae Brenner et al. 1993

Category: Species

Proposed as: sp. nov.

Etymology: young’ae. N.L. gen. fem. n. youngae, to honor Viola M. Young, an American microbiologist, for her contributions to the genus Citrobacter, including the description of C. amalonaticus [L. amalonatica]

Gender: masculine

Type strain: 460-61; ATCC 29935; CCUG 30791; CDC 460-61; CIP 105016; DSM 17578; NCTC 13709

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M59291 Analyse FASTA

Valid publication: Brenner DJ, Grimont PA, Steigerwalt AG, Fanning GR, Ageron E, Riddle CF. Classification of citrobacteria by DNA hybridization: designation of Citrobacter farmeri sp. nov., Citrobacter youngae sp. nov., Citrobacter braakii sp. nov., Citrobacter werkmanii sp. nov., Citrobacter sedlakii sp. nov., and three unnamed Citrobacter genomospecies. Int J Syst Bacteriol 1993; 43:645-658.

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 43, part 4 of the IJSB. Int J Syst Bacteriol 1994; 44:184.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Notes:
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2.
  • 🎓 Name mentioned 36 times in PubMed until 2024-03-28.
  • 🧍 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.
  • 🧍 Citrobacter youngae Brenner et al. 1993 was previously known as Citrobacter genomospecies 5. Publication: Werkman CH, Gillen GF. Bacteria Producing Trimethylene Glycol. J Bacteriol 1932; 23:167-182.

Parent taxon: Citrobacter Werkman and Gillen 1932 (Approved Lists 1980)

Assigned by: Brenner DJ, Grimont PA, Steigerwalt AG, Fanning GR, Ageron E, Riddle CF. Classification of citrobacteria by DNA hybridization: designation of Citrobacter farmeri sp. nov., Citrobacter youngae sp. nov., Citrobacter braakii sp. nov., Citrobacter werkmanii sp. nov., Citrobacter sedlakii sp. nov., and three unnamed Citrobacter genomospecies. Int J Syst Bacteriol 1993; 43:645-658.

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Record number: 774758