Genus Yokenella (Koserella)
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus Yokenella,   
Yokenella regensburgei Kosako et al. 1985, synonym: Koserella trabulsii Hickman-Brenner et al. 1985.
Other synonyms: Hafnia hybridization group 3, CDC Enteric Group 45.
Gram negative, rods. Motile at 36 ºC by peritrichous flagella.
S-type colonies, nonpigmented. Facultatively anaerobic, growth temperature 28-37 ºC.
No growth at 4 ºC.
Media: Nutrient Agar or Nutrient Broth, Trypticase Soy Agar ± 5% sheep blood.
Isolated from water, human clinical specimens (stools, knee fluid, wounds), animals (sheep intestine) and insects.
Resistant to colistin, penicillin, ampicillin, carbenicillin, cephalothin and some strains to streptomycin.
May be associated with bacteremia and wound infections in humans.
  1. J. G.Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9th-edition, Williams & Wilkins.
  2. Kosako Y., Sakazaki R. & Yoshizaki E.: Yokenella regensburgei gen. nov., sp. nov.: a new genus and species in the family
    Enterobacteriaceae. Jpn. J. Med. Sci. Biol., 1984, 37, 117-124 (VALIDATION LIST N° 17. Int. J. Syst. Bacteriol., 1985, 35, 223-225).
  3. Kosako Y., Sakazaki R., Huntley-Carter G.P. & Farmer III J.J.: Yokenella regensburgei and Koserella trabulsii are subjective
    synonyms. Int. J. Syst. Bacteriol., 1987, 37, 127-129.
  4. Hickman-Brenner F.W., Huntley-Carter G.P., Richard G.: Koserella trabulsii, a new genus and species of Enterobacteriaceae
    formerly known as Enteric Group 45. Journal of Clinical Bacteriology, Jan. 1985, p. 39-42.
  5. Don J. Brenner and J.J. Farmer III, 2001. Family I. Enterobacteriaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second
    edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp 587-897.
Yokenella regensburgei can be differentiated from Hafnia species by its ability to utilize
citrate and to produce acid from cellobiose, melibiose and D-arabitol.

Positive results for methyl red, citrate utilization (Simmons), lysine decarboxylase,
ornithine decarboxylase, growth in the presence of cyanide, beta-galactosidase,
tetrathionate reductase, acid production from glucose (with gas production), D-mannitol, L-arabinose, L-rhamnose, maltose, D-
xylose, trehalose, cellobiose, melibiose, D-mannose, D-galactose, L-fucose & D-gluconate.

Negative results for indole production, Voges–Proskauer, H
2S production (TSI), urea hydrolysis, phenylalanine deaminase, arginine
dihydrolase, malonate utilization, gelatin hydrolysis, lipase (corn oil and Tween 80), DN-ase, esculin hydrolysis, pectinase, chitinase,
beta-xylosidase, acid production from adonitol, lactose, sucrose, dulcitol, salicin,  myo-inositol, D-sorbitol, raffinose, alpha-methyl-D-
glucoside, erythritol, D-arabitol, glycerol & mucate.
(c) Costin Stoica
Antibiogram
Encyclopedia
Culture media
Biochemical tests
Stainings
Images
Movies
Articles
Identification
Software
R E G N U M
PROKARYOTAE
Previous page
Back