ABIS Encyclopedia

Genus Cedecea

Legend: + positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains

Taxonomy

Morphology

Cultural characteristics

Biochemical characters

Ecology

Pathogenicity

References

Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacterales, Family Enterobacteriaceae, Genus Cedecea,
- Cedecea davisae Grimont et al. 1981 - type species of the genus,
- Cedecea lapagei Grimont et al. 1981,
- Cedecea neteri Farmer et al. 1983,
- “Cedecea species 3”,
- “Cedecea species 5”.

Gram-negative rods, 0.6-0.7 x 1.3-1.9 μm. Motile by 5-9 peritrichous flagella.

Colonies on nutrient agar are 1.5 mm in diameter (24 h, 37 °C), nonpigmented.
Facultatively anaerobic. Incubation temperature 25-37 °C.
Media: Trypticase Soy Agar with 5% sheep blood.
Nutrient Agar (Oxoid CM3) (beef extract 1 g, yeast extract 2 g, peptone 5 g, NaCl 5 g,
agar 15 g, distilled water 1l, pH 7,4).

Isolated from human clinical specimens (blood, sputum, wounds, gallbladder, eye, abscess, throat), feces, some parasitic
arthropods & cockroaches Blatta germania and Blatta orientalis. Resistant to colistin, polymyxin, penicillin, ampicillin & cephalothin.

Opportunistic pathogen. Associated with infections in humans (bacteremia), one report of C. lapagei peritonitis after surgical
intervention. Appears to be a tick pathogen: females of the tick B. microplus may be infected with Cedecea lapagei which destroys the
epithelium of the vaginal area.

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.
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.
Grimont (P.A.D.), Ggrimont (F.), Farmer III (J.J.) and Asbury (M.A.): Cedecea davisae gen. nov., sp. nov. and Cedecea lapagei sp.
nov., new Enterobacteriaceae from clinical specimens. Int. J. Syst. Bacteriol., 1981, 31, 317-326;
Farmer III (J.J.), Sheth (N.K.), Hudzinski (J.A.), Rose(H.D.) and Asburi (M.F.): Int. J. Syst. Bacteriol., 1983, 33, 438-440. Bacteremia
due to Cedecea neteri sp. nov. J. Clin. Microbiol., 1982, 16, 775-778.
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 nitrate reduction, methyl red, Voges–Proskauer, citrate utilization
(Simmons), lipase (corn oil,Tween 40, Tween 60, Tween 80, and tributyrin), esculin hydrolysis (most of them), acid production from: D-
glucose, D-mannitol, salicin, maltose, trehalose, cellobiose, D-arabitol, D-mannose and D-galactose.

Negative results for gelatin hydrolysis, DN-ase, chitinase, polygalacturonase, amylase, indole production, H2S production (TSI), urea
hydrolysis, phenylalanine deaminase, lysine decarboxylase, tartrate, acid production from: dulcitol, adonitol, myo-inositol, L-arabinose,
L-rhamnose, alpha-methyl-D-glucoside, erythritol, glycerol and mucate.