Leclercia

Abstract

Le.clerc' i.a . M.L. fem. n. Leclercia named to honor H. Leclerc, a French bacteriologist, who first described and named this organism Escherichia adecarboxylata in 1962, and who made many other contributions to enteric bacteriology. Proteobacteria / Gammaproteobacteria / Enterobacteriales / Enterobacteriaceae / Leclercia Small rod‐shaped cells, conforming to the general definition of the family Enterobacteriaceae . Gram negative. Motile at 36°C and 25°C with peritrichous flagella. Facultatively anaerobic. Catalase positive. Oxidase negative. Many strains produce a nondiffusible yellow pigment that may be weak and may be lost on storage and subculture . Ferment, rather than oxidize, D ‐glucose and other carbohydrates. Reduce nitrate to nitrite. Positive for indole production, methyl red, growth in the presence of cyanide, malonate utilization, esculin hydrolysis, ONPG, and the fermentation of lactose , d ‐ mannitol, dulcitol, salicin, adonitol , l ‐ arabinose , l ‐ rhamnose, maltose , d ‐ xylose, trehalose, cellobiose, erythritol, esculin, melibiose , d ‐ arabitol, mucate , d ‐ mannose, and D ‐galactose. Produce visible gas during fermentation . Negative for Voges–Proskauer, citrate utilization (Simmons), H 2 S production (TSI), phenylalanine deaminase, lysine decarboxylase, arginine dihydrolase, ornithine decarboxylase , gelatin hydrolysis (22°C), lipase (corn oil) production, DNase production, and the fermentation of myo ‐inositol, D ‐sorbitol, α‐methyl‐ D ‐glucoside, and erythritol. Most strains are susceptible to colistin, nalidixic acid, sulfadiazine, gentamicin, streptomycin, kanamycin, tetracycline, chloramphenicol, carbenicillin, cephaloridine, and ampicillin (disk diffusion method on Mueller–Hinton agar); resistant to penicillin . The mol % G + C of the DNA is : 52–55. Type species : Leclercia adecarboxylata (Leclerc 1962) Tamura, Sakazaki, Kosako, and Yoshizaki 1987, 179 (Effective publication: Tamura, Sakazaki, Kosako, and Yoshizaki 1986, 183) ( Escherichia adecarboxylata Leclerc 1962, 737.)