Veterinary bacteriology: information about important bacteria
|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]
|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-|
|Other Enzymes:||Tryptophanase - and urease -|
|Fermentation of carbohydrates:||Glucose(gas) -, Mannitol +, Rhamnose -, Sorbitol - and Sucrose -. Cf. other Yersinia spp.|
|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.:|
||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.|
|New names of bacterial phyla|
The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.Published 2023-03-01. Read more...
|The taxonomy of chlamydias|
Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBactPublished 2023-03-15. Read more...