Edwardsiella ictaluri
Pathogenicity
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacterales, Family Hafniaceae, Genus Edwardsiella, Edwardsiella
ictaluri
Hawke et al. 1981.
Gram-negative, straight bacilli, 1.0 x 2.0-3.0 μm. Non-motile. No capsule production.
Colonies are smooth, circular (1-2 mm diameter), slightly convex non-pigmented
colonies. Center-black colonies on SS agar. The bacteria grows slowly but does not
require special nutrients. Optimum temperature 25-30 ºC. Facultatively anaerobic.
Isolated from catfish (Ictalurus punctatus). Also isolated from nonictalurid fish, such as the tropical danio or green knifefish, and from
a hepatic abscess of a dog.
E. ictaluri causes 'enteric septicaemia of catfish' (disease may have 2 forms: chronic encephalitis or acute septicaemia’, may cause
sudden massive die-offs of up to 50% of pond population.). One report of hepatic abscesses in dog.
  1. 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.
  2. 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, pp175-189.
  3. De Vos et al.: Judicial Commission of the International Committee on Systematics of Prokaryotes Xth International (IUMS)
    Congress of Bacteriology and Applied Microbiology. Minutes of the meetings, 28, 29 and 31 July and 1 August 2002, Paris, France.
    Int. J. Syst. Evol. Microbiol., 2005, 55, 525-532.
  4. 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 catalase, lysine decarboxylase, nitrate reduction, ornithine decarboxylase, acid production from: maltose,
mannose and glucose (usually with gas production).

Negative results for arginine dihydrolase, citrate utilization (Simmons), DN-ase, esculin hydrolysis, gelatinase, beta-galactosidase,
beta-glucuronidase, lipase (Tween 80), malonate utilization, oxidase, L-pyrrolidonyl aminopeptidase, phenylalanine
deaminase,growth in KCN medium, urease (Christensen), Voges-Proskauer, acid production from: adonitol, D-arabitol,
alpha-methyl-D-glucoside, D-cellobiose, dulcitol, inositol, lactose, melibiose, raffinose, L-rhamnose, D-sorbitol and D-xylose.
(c) Costin Stoica
Antibiogram
Encyclopedia
Culture media
Biochemical tests
Stainings
Images
Movies
Articles
Identification
Software
R E G N U M
PROKARYOTAE
Legend:  + positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains
 
Hydrogen
sulfide (TSI)
Methyl red
Indole
production
L-Arabinose
fermentation
D-Mannitol
fermentation
Sucrose
fermentation
Trehalose
fermentation
E. tarda / E. piscicida
+
+
+
-
-
-
-
E. tarda biogroup 1
-
+
+
+
+
+
-
E. hoshinae
+
+
d
[-]
+
+
+
E. ictaluri
+
-
-
-
-
-
-
Differential characters between Edwardsiella species:
Previous page
Back