Aeromonas jandaei
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Aeromonadales, Family Aeromonadaceae, Genus Aeromonas,
Aeromonas jandaei
Carnahan et al. 1992.
Formerly genospecies DNA group 9
Aeromonas sobria.
Gram-negative, straight rods. Motile by a single polar flagellum. Occurs singly, in
pairs, or chains.
Colonies develop within 24 hours at 28 ºC on TSA and are not pigmented. No brown
water-soluble pigment is produced. Growth occurs on MacConkey agar. Facultatively
anaerobic. Beta-hemolytic on sheep blood agar (sometimes after 2 days incubation).
Mesophilic, growth occurs  at temperatures between 4 and 42 ºC, under alkaline (pH
8.5) conditions and in the presence of 0-3% (w/v) NaCl. Does not grow at pH 4.5.
Isolated from clinical specimens (wounds, blood, and feces) of humans, aquatic sources, fish (eels), and prawns.
Resistant to colistin (4 µg/ml), cephalotin, ampicillin and penicillin. Resistant to vibriostatic agent O/129 (150 µg).
Mostly virulent for eels and mice. Pathogenicity to mice results in a pathogenic significance for humans. Produce beta-hemolysins
against human red blood cells.
  1. A. Carnahan, G. R. Fanning, and S. W. Joseph. Aeromonas jandaei (formerly genospecies DNA group 9  A. sobria), a new
    sucrose-negative species isolated from clinical specimens. J. Clin. Microbiol. March 1991 29:3 560-564.
  2. Consuelo Esteve, Lazara Valera, Carmen Gutiérrez, and Antonio Ventosa. Taxonomic study of sucrose-positive Aeromonas
    jandaei-like isolates from faeces, water and eels: emendation of A. jandaei Carnahan et al. 1992. Int J Syst Evol Microbiol
    September 2003 53:1411-1419.
  3. Amy Martin-Carnahan and Samuel W. Joseph 2004. Order XII. Aeromonadales ord. nov. In:  Bergey’s Manual of Systematic
    Bacteriology, Second edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp. 556-587.
Positive results for catalase, oxidase, nitrates reduction, indole production, ONPG, citrate utilization, acetate utilization, gelatin
hydrolysis, arginine, dihydrolase, lysine decarboxylase, DN-ase, lipase (corn oil), acid production from: fructose, D-galactose,
D-glucose (with gas production), glycerol, maltose, D-mannitol, mannose & D-trehalose.

The sucrose-negative reaction usually differentiates
A. jandaei from other Aeromonas.
Negative results for esculin hydrolysis, urea hydrolysis, malonate utilization, elastase, ornithine decarboxylase, acid production from:
L-arabinose, adonitol, D-amygdalin, D-arabitol, dulcitol, erythritol, inositol, D-raffinose, L-rhamnose, D-sorbitol, sucrose & D-xylose.

Variable results for growth in KCN medium, Voges-Proskauer test, H
2S production from cysteine thiosulphate, acid production from:
alpha-methyl-D-glucoside, cellobiose, lactose, melibiose & salicin.
(c) Costin Stoica
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