Veterinary bacteriology: information about important bacteria
|Etymology:||Genus name: named after the American bacteriologist P. R. Edwards (1901-1966).|
Species epithet: refers to catfish (genus Ictalurus).
|Significance:||Har betydelse i de länder där man odlar dvärgmal, t.ex. USA, Australien och Thailand. Sjukdomen har aldrig påvisats i Sverige.
[Of minor importance]
|Type Strain:||SECFDL (Southeastern Cooperative Fish Disease) Laboratory) GA 77-52 = ATCC 33202 = CCUG 18764 = NCTC 12122.|
|Micromorphology:||Nonmotile short rods (0.8 x 1-3 µm).|
|Gram +/Gram -:||G-|
|Other Enzymes:||DNase -, esculinase -, ornithine decarboxylase v, tryptophanase - (cf. E. tarda), urease -.|
|Biochemical Tests:||Citrate -, hydrogen sulfide v, methyl red -, Voges-Proskauer -|
|Fermentation of carbohydrates:||
All strains ferment glucose under acid production and half of the strains also under gas production.
|Spec. Char.:||Does not grow at 42°C (cf. E. tarda).|
|Disease:||"Hole in the head disease".
|Hosts:||Fish of the genus dwarf catfish, especially channel catfish (Ictalurus punctatus).|
|Clinical Picture:||Spot formed bleeding in the oral cavity, throat, abdomen and at the bases of the fins.|
|16S rRNA Seq.:|
||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.|
|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...