Aeromonas caviae (Aeromonas punctata)
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Aeromonadales, Family Aeromonadaceae, Genus Aeromonas,
Aeromonas caviae
(ex Eddy 1962) Popoff 1984.
The nomenclature is still in discussion.
A. caviae (ex Eddy 1962) Popoff 1984, A. punctata (Zimmermann 1890) Snieszko 1957
(Approved Lists 1980) and
A. punctata subsp. caviae (Scherago 1936) Schubert 1964 (Approved Lists 1980) have the same type
strain and therefore are homotypic synonyms.
This is because the type strain of
A. punctata is incorrectly listed on the 1980 Approved
List of Bacterial Names as ATCC 15468, when it should have been NCMB 74.
Gram-negative, straight rods with rounded ends, sometimes coccobacilli, 0.3–1.0 x
1.0–3.5 µm. Motile by a polar flagellum (variable characteristic).
Colonies are smooth, circular, convex, 1–3 mm in diameter. No brown, water-soluble
pigment is produced on TSA medium. Hemolysis is not produced on sheep blood
agar. Mesophilic,optimum growth temperature 28 ºC. Can grow in nutrient broth with:
0 and 3% NaCl. Cannot survive in low pH media.
Isolated from fresh water, sewage, and on domestic and wild animals, birds, fish (Tilapia) and human clinical samples (blood and
stool cultures). Resistant to vibriostatic agent O/129.
Etiological agent of gastroenteritis in young children. Causes extraintestinal disease primarily in immunocompromised humans. May
be associated with gastrointestinal disease in adults.
A. caviae is capable of adhering to human epithelial cells and cytotoxin producing.
  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. H. Namdari and E. J. Bottone. Microbiologic and clinical evidence supporting the role of Aeromonas caviae as a pediatric enteric
    pathogen. J Clin Microbiol. 1990 May; 28(5): 837–840.
  3. M. Dwivedi; A. Mishra; A. Prasad; A. Azim; R.K. Singh; A.K. Baronia; K.N. Prasad; U.N. Dwivedi. Aeromonas caviae septicemia in
    immunocompetent gastrointestinal carriers. Braz J Infect Dis vol.12 no.6 Salvador Dec. 2008.
Positive results for catalase, oxidase, nitrates reduction, indole production, ONPG,
citrate utilization, acetate utilization, growth in KCN medium, arginine dihydrolase,
esculin hydrolysis, acid production from: L-arabinose, cellobiose, maltose, D-mannitol, salicin, sucrose & D-trehalose.

Negative results for urea hydrolysis, malonate utilization, Voges-Proskauer test, gelatin hydrolysis, lysine decarboxylase, ornithine
decarboxylase, DN-ase, H
2S production from cysteine thiosulphate, elastase, acid production from: adonitol, D-arabitol, dulcitol,
erythritol, alpha-methyl-D-glucoside, D-glucose, inositol, melibiose, D-raffinose, L-rhamnose, D-sorbitol, D-xylose,

Variable results for corn oil lipase, acid production from D-amygdalin, glycerol, lactose & mannose. The lactose-positive strains of
A.
caviae
may be confused with coliforms when testing water sources.
(c) Costin Stoica
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