Phylum Proteobacteria, Class Gammaproteobacteria, Order Aeromonadales, Family Aeromonadaceae, Genus Aeromonas,
Aeromonas sobria Popoff and Veron 1981.
Gram-negative, straight rods. Motile by a polar flagellum.
No brown diffusible pigment is produced on TSA. Beta-hemolysis on 5% sheep blod
agar is negative. Mesophilic. Optimum growth temperature 28-30 ºC. There is no
growth at 42 ºC. Grow in nutrient broth with 0% NaCl. No growth in 6% NaCl or in KCN
Isolated from aquatic animals (fish, frog). A. sobria, has not been isolated from human clinical specimens. However, there is a
continuing use of this species name for clinical isolates, which resemble A. sobria but are actually A. veronii biovar sobria.
Resistant to vibriostatic agent O/129.
Undetermined. May be an opportunistic pathogen.
- M. Popoff and M. Veron. A Taxonomic Study of the Aeromonas hydrophila-Aeromonas punctata Group. J Gen Microbiol May 1976 94:
- 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.
Biochemically close to A. veronii biovar sobria.
Positive results for oxidase, nitrates reduction, indole production, ONPG, citrate
utilization, acetate utilization, lipase (corn oil), H2S production from cysteine, acid
production from: cellobiose, glucose (with gas production), glycerol, maltose,
D-mannitol, mannose, sucrose & trehalose.
Negative results for urease, malonate utilization, arginine dihydrolase, ornithine decarboxylase, DN-ase, elastase, esculin hydrolysis
acid production from: adonitol, L-arabinose, D-amygdalin, D-arabitol, dulcitol, erythritol, inositol, lactose, melibiose, D-raffinose,
L-rhamnose, salicin, D-sorbitol & D-xylose.
Variable results for Voges-Proskauer test, gelatin hydrolysis, lysine decarboxylase & acid production from alpha-methyl-D-glucoside.
(c) Costin Stoica