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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Edwardsiella ictaluri
Etymology: Genus name: named after the American bacteriologist P. R. Edwards (1901-1966).
Species epithet: refers to catfish (genus Ictalurus).
Significance:Har betydelse i de länder där man odlar dvärgmal, t.ex. USA, Australien och Thailand. Sjukdomen har aldrig påvisats i Sverige.
  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Enterobacterales
Family
Hafniaceae 
Genus
Edwardsiella
Type Strain: SECFDL (Southeastern Cooperative Fish Disease) Laboratory) GA 77-52 = ATCC 33202 = CCUG 18764 = NCTC 12122.
Macromorphology (smell):
Micromorphology: Nonmotile short rods (0.8 x 1-3 µm).
Gram +/Gram -:G-
Metabolism: Facultatively anaerobic
Catalase/Oxidase:?/-
Other Enzymes: DNase -, esculinase -, ornithine decarboxylase v, tryptophanase - (cf. E. tarda), urease -.
Biochemical Tests: Citrate -, hydrogen sulfide v, methyl red -, Voges-Proskauer -
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+-+--
L-arabinosecellobioseD-mannitolsalicintrehalose
-----
glycerolinulinraffinoseD-sorbitolstarch
-?--?
All strains ferment glucose under acid production and half of the strains also under gas production.
Spec. Char.: Does not grow at 42°C (cf. E. tarda).
Disease:"Hole in the head disease".
Hosts: Fish of the genus dwarf catfish, especially channel catfish (Ictalurus punctatus).
Clinical Picture: Spot formed bleeding in the oral cavity, throat, abdomen and at the bases of the fins.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_012779 93-146 3 812 315 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
AB050826 JCM1680T? 1 466 99.86-100% 

Taxonomy/phylogeny:
 
Four species have been described within the genus Edwardsiella. These bacteria belong to the familyEnterobacteriaceae and they are relatively closely related to bacteria within the genera Morganella and Proteus.
Reference(s): No. 174
Updated:2022-04-13

News

New families introduced within the order Enterobacterales
Phylogenetic tree for the order <i>Enterobacteriales</i>.

The order Enterobacterales (formerly called Enterobacteriales) previously consisted of bacteria with different properties and phylogenetically, these bacteria were far apart. In order for the taxonomy to be more in line with phylogeny, some of these bacteria have, therefore, been sorted into 6 new families.

Published 2022-04-13. Read more...

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