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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Yersinia ruckeri
Categories: Causes hemolysis; in the normal flora; notifiable diseases and bacteria
Etymology: Genus name: named after the French bacteriologist A.J.E. Yersin, who in 1894 first isoleted the bacterium which causes the plague.
Species epithet: named after R.R. Rucker, who studied the red mouth disease and its causative agent.
Significance:The disease has been has been found in farmed fish since 1985 in Sweden and recently also in wild fish.
  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Enterobacterales
Family
Yersiniaceae 
Genus
Yersinia
Type Strain: ATCC 29473 = CCUG 14190 = NCTC 12986
Macromorphology (smell): Small (0.5-1 mm in diameter) white greyish colonies
Micromorphology: Motile rods (1 x 2-3 µm) with peritrichous flagella
Gram +/Gram -:G-
Metabolism: Facultatively anaerobic
Catalase/Oxidase:+/-
Other Enzymes: Tryptophanase - and urease -
Fermentation of carbohydrates: Glucose(gas) -, Mannitol +, Rhamnose -, Sorbitol - and Sucrose -. Cf. other Yersinia spp.
Spec. Char.:
Vector: Certain other fish species
Disease:Enteric redmouth (ERM) disease (or just redmouth disease) or yersiniosis
Hosts: Freshwater and marine fish, particularly salmonids
Clinical Picture: Subcutaneous hemorrhaging of the mouth, fins, and eyes and also on internal organs.
Virulence Factors: Produce a so-called siderophore (for iron uptake) called ruckerbactin.
16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF366385 ATCC 29473T 1 461  

Taxonomy/phylogeny:
 
Within the genus Yersinia, 20 species have been described. All species belong to the family Enterobacteriaceae.
Comment:Red mouthe disease is a notifyable disease in Sweden.
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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