Genus Leclercia
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus Leclercia,  
Leclercia adecarboxylata Tamura et al. 1987, basonym: Escherichia adecarboxylata  Leclerc 1962 - single species of the genus.
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.
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. Begey’s manual of Determinative Bacteriology, 9th-edition, Williams & Wilkins.
  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.
Positive results for catalase, indole production, methyl red, growth in the presence of
KCN, malonate utilization, esculin hydrolysis, ONPG, acid production from: glucose
(with gas), lactose, D-mannitol, dulcitol, salicin, adonitol, L-arabinose, L-rhamnose,
maltose, D-xylose, trehalose, cellobiose, melibiose, D-arabitol, mucate, D-mannose &
D-galactose.

Negative results for oxidase Voges–Proskauer, citrate utilization (Simmons), H
2S production (TSI), phenylalanine deaminase, lysine
decarboxylase, arginine dihydrolase, ornithine decarboxylase, gelatin hydrolysis, lipase (corn oil), DN-ase, acid production from:
alpha-methyl-D-glucoside, erythritol, myo-inositol & D-sorbitol.
(c) Costin Stoica
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