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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Edwardsiella tarda
Category: Motile
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).
Disease:Edwardsiellosis, septicemia in catfish and eels. "Red disease" of cultured eel.
Hosts: Fish, 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:
 
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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