Veterinary bacteriology: information about important bacteria
|Etymology:||Genus name: rod shaped (bacterium) in ungulates. |
Species epithet: full of knots (refers to the shape of the cells).
|Significance:||The disease causes economic losses and animal suffering in large parts of the world.
|Alternative Species Name(s):||Bacteroides nodosus|
|Type Strain:||ATCC 25549 = CCUG 27824.|
||Small (0.5-3.0 mm in diameter) translucent grayish white colonies after 3-7 days. Grows slowly and the colonies are difficult to see. Gives no hemolysis on FAA plates.|
||Straight or curved rods (1-1.7 x 3-6 µm) with rounded and enlarged ends. Has twitching motility by means of type IV pili.|
|Gram +/Gram -:||G-|
|Other Enzymes:||DNase -, esculinase -, ornithine decarboxylase +, tryptophanase (indole) -, urease -.|
|Biochemical Tests:||H2S +|
|Fermentation of carbohydrates:||D. nodosus does not ferment carbohydrates.|
|Special Media:||Hoof agar is often used for isolation of D. nodosus.|
|Virulence Factors:||Type IV pili (fimbriae) which give the bacteria motility in damaged tissue. Extracellular serine protease which makes it possible for the bacterium to digest the tissue of the host animal to get access to free amino acids.|
|Diagnostics:||Gram staining of clinical material, microscopy, culture and confirmation by PCR or MALDI-TOF MS. Benign strains can be differentiated from virulent ones by PCR.|
|16S rRNA Seq.:|
||Only one species has been described within genus Dichelobacter and this species is related to species within genus Stenotrophomonas.|
|Reference(s):||No. 2, 39, 127|
|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...