| Species/Subspecies: | Edwardsiella tarda | ||||||||||
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| 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] |
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| Taxonomy: | Class Gammaproteobacteria Order Enterobacterales Family Hafniaceae Genus Edwardsiella |
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| 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-glucose + lactose - maltose + L-rhamnose - sucrose v L-arabinose v cellobiose - D-mannitol v salicin - trehalose - glycerol (-) inulin ? raffinose - D-sorbitol - starch ? |
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| Spec. Char.: | Can grow at 42°C (cf. E. ictaluri). | ||||||||||
| Special Media: | |||||||||||
| Disease: | Edwardsiellosis, septicemia in catfish and eels. "Red disease" of cultured eel. |
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| Hosts: | Fish, eel | ||||||||||
| Clinical Picture: | |||||||||||
| Virulence Factors: | Chondroitinase, quorum sensing and siderophore-mediated uptake of iron. | ||||||||||
| Genome Sequence: |
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| 16S rRNA Seq.: |
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| Taxonomy/phylogeny:
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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: | 2023-03-29 |