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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology
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Species/Subspecies: Edwardsiella tarda
Etymology: Genus name: named after the American bacteriologist P. R. Edwards (1901-1966).
Species epithet: slow (refers to the fact that it is biochemically inactive and can only ferment few carbohydrates).
Significance:More common in Asia than in the USA. Has been isolated from farmed and wild eel in Sweden.
  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Enterobacteriales
Family
Enterobacteriaceae 
Genus
Edwardsiella
Type Strain: ATCC 15947 = CCUG 1638 = NCTC 10396.
Macromorphology (smell):
Micromorphology: Motile rod
Gram +/Gram -:G-
Catalase/Oxidase:?/-
Other Enzymes: DNase -, esculinase -, ornithine decarboxylase +, tryptophanase + (cf. E. ictaluri), ureas -.
Biochemical Tests: Citrate -, methyl red +, Voges-Proskauer -, hydrogen sulfide -.
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+-+-v
L-arabinosecellobioseD-mannitolsalicintrehalose
v-v--
glycerolinulinraffinoseD-sorbitolstarch
(-)?--?
All strains ferment glucose under acid production and some of the strains also under gas production.
Spec. Char.: Can grow at 42°C (cf. E. ictaluri).
Hosts: Fish, eel
Disease (Swedish):Reservoir: Edwardsiellos
Disease (English):Edwardsiellosis, septicemia in catfish and eels. "Red disease" of cultured eel.
Clinical Picture:
Virulence Factors: Chondroitinase, quorum sensing and siderophore-mediated uptake of iron.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_013508 EIB202 3 760 463  1c + 1c 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
AB050827 ATCC 15947T 1 399 100% 

Taxonomy/phylogeny:
Edwardsiella tarda  
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.
Updated:2018-05-03

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