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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

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During October 2021, an article was published by A. Oren och G.M. Garrity, in which new names are proposed for a number of taxa within the classification category phylum. This has resulted in many discussions in social media about whether it was really necessary to make these changes, which have created confusion among microbiologists and other professionals who come into contact with bacteriology.

Published 2022-09-28. Read more...

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