Leclercia tamurae / L. adecarboxylata
yellow colonies on Sheep Blood Agar
Gram-negative cells
Leclercia adecarboxylata
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacterales, Family Enterobacteriaceae, Genus Leclercia,  
Leclercia adecarboxylata Tamura et al. 1987 - type species of the genus.

Basonym: Escherichia adecarboxylata  Leclerc 1962.
Possible synonym: CDC Enteric Group 41.
Gram-negative, straight rods. Motile at 25-36 °C.
Yellowish colonies. No special growth requirements. Facultatively anaerobic, growth
temperature 30-37 °C. Grow on media: Nutrient agar or nutrient broth; Trypticase Soy
Agar ± 5% sheep blood; MacConkey agar. Non-haemolytic (admin note).
Widely distributed in nature (soil, water, food). Isolated from environmental and
clinical specimens (rarely). Resistant to penicillin.
Pathogenicity undetermined (opportunistic pathogen). Isolated from patients with
bacteremia, peritonitis, gallbladder infections (mixed with other germs). Isolated from
peritonitis in a child (1 report). Most strains were isolated from patients with
neutropenia.
There is no evidence that feces isolates can cause diarrhea or intestinal infections.
  1. J. G. Holt et al., 1994. Facultatively Anaerobic Gram-Negative Rods. Subgroup 1. Family Enterobacteriaceae. In: Begey’s Manual of
    Determinative Bacteriology, 9th-edition, Williams & Wilkins, pp 175-189.
  2. 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.
  3. Thierry de Baere et al.: Isolations of Leclercia adecarboxylata from a Patient with a Chronically Inflamed Gallbladder and from a
    Patient with Sepsis without Focus. Journal of Clinical Microbiology, April 2001, 1674-1675, Vol. 39, No. 4.
  4. Leclerc, H. 1962. Etude biochimique d'enterobacteriaceae pigmentées. Ann. Inst. Pasteur. 102:726-741.
  5. Tamura K., Sakazaki R., Kosako Y. & Yoshizaki E.: Leclercia adecarboxylata gen. nov., comb. nov., formerly known as Escherichia
    adecarboxylata. Curr. Microbiol., 1986, 13, 179-184.
  6. Adeolu M, Alnajar S, Naushad S, S Gupta R. Genome-based phylogeny and taxonomy of the 'Enterobacteriales': proposal for
    Enterobacterales ord. nov. divided into the families Enterobacteriaceae, Erwiniaceae fam. nov., Pectobacteriaceae fam. nov.,
    Yersiniaceae fam. nov., Hafniaceae fam. nov., Morganellaceae fam. nov., and Budviciaceae fam. nov. Int J Syst Evol Microbiol
    2016; 66:5575-5599.
Positive results for catalase, indole production, methyl red, growth in the presence of
KCN, malonate utilization, esculin hydrolysis, ONPG, acid production from: adonitol,
D-arabitol, L-arabinose, glucose (with gas), lactose, D-mannitol, dulcitol, salicin,
L-rhamnose, maltose, D-xylose, trehalose, cellobiose, melibiose, mucate,
D-mannose and D-galactose.

Negative results for arginine dihydrolase, citrate utilization (Simmons), DN-ase, H2S
production (TSI), phenylalanine deaminase, lysine decarboxylase, ornithine
decarboxylase, gelatin hydrolysis, lipase (corn oil), oxidase, Voges-Proskauer test,
acid production from: alpha-methyl-D-glucoside, erythritol, myo-inositol and D-sorbitol.

Variable fermentation of sucrose.
L. tamurae can be differentiated from L. adecarboxylata by  utilization of citrate and
fermentation of adonitol and sorbitol.
(c) Costin Stoica
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