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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
Enterobacterales
Family
Hafniaceae 
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.
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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