Aeromonas enteropelogenes (Aeromonas trota)
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Aeromonadales, Family Aeromonadaceae, Genus Aeromonas,
Aeromonas enteropelogenes
Schubert et al. 1991 (Aeromonas trota Carnahan et al. 1992).
According to Huys et al. 2002,
A. enteropelogenes is an earlier heterotypic synonym of Aeromonas trota. They are identical, as
revealed by small-subunit rRNA sequence analysis. In a previous study, the two type strains exhibited identical API 20E and API
50CHE biochemical profiles and were both susceptible to ampicillin and carbenicillin.
Gram-negative, straight rods. Motile by a polar flagellum.
Colonies are smooth, circular, convex, 1–3 mm in diameter. No brown, water-soluble
pigment is produced on TSA medium. Beta-hemolysis on sheep blood agar is
variable. Mesophilic, optimum growth temperature 28 ºC. Can grow in nutrient broth
with 0-3% NaCl and slowly up to 5-6% NaCl (48h).
Isolated from aquatic sources, feces and extraintestinal human infections.
Resistant to vibriostatic agent O/129. Susceptible to carbenicillin and ampicillin (unusual for the most Aeromonads).
May be involved in cases of pediatric diarrhea. Posses the 'aerolysin' production gene.
  1. 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.
  2. M. D. Collins, A. J. Martinez-Murcia, and J. Cai. Aeromonas enteropelogenes and Aeromonas ichthiosmia Are Identical to
    Aeromonas trota and Aeromonas veronii, Respectively, as Revealed by Small-Subunit rRNA Sequence Analysis. Int J Syst
    Bacteriol October 1993 43:855-856.
  3. A. M. Carnahan, T. Chakraborty, G. R. Fanning, D. Verma, A. Ali, J. M. Janda and S. W. Joseph. Aeromonas trota sp. nov., an
    ampicillin-susceptible species isolated from clinical specimens. J. Clin. Microbiol. June 1991 vol. 29 no. 6 1206-1210.
  4. Geert Huys, Rik Denys, and Jean Swings. DNA-DNA reassociation and phenotypic data indicate synonymy between Aeromonas
    enteropelogenes Schubert et al. 1990 and Aeromonas trota Carnahan et al. 1991. Int J Syst Evol Microbiol November 2002 52:
    1969-72.
  5. Delamare, A.P.L., Costa, S.O.P., Da Silveira, M.M. & Echeverrigaray, S. (2000). Growth of Aeromonas species on increasing
    concentrations of sodium chloride. Lett Appl Microbiol 30, 57-60.
Positive results for catalase, oxidase, nitrates reduction, indole production, ONPG,
acetate utilization, gelatin hydrolysis, lysine decarboxylase, arginine dihydrolase,
DN-ase, acid production from cellobiose, maltose, mannose & D-trehalose.

Negative results for urea hydrolysis, malonate utilization, Voges-Proskauer test, ornithine decarboxylase, lipase (corn oil), H
2S
production from cysteine thiosulfate, elastase, esculin hydrolysis, tryptophan deaminase, acid production from: adonitol,
D-amygdalin, L-arabinose, D-arabitol, dulcitol, erythritol, inositol, lactose, alpha-methyl-D-glucoside, melibiose, D-raffinose,
L-rhamnose, salicin, D-sorbitol xylitol, L- or D-xylose.

Variable results for citrate utilization, growth in KCN medium, acid production from: D-glucose (with gas production), glycerol,
D-mannitol & sucrose.
(c) Costin Stoica
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