VetBact logo


Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Ehrlichia ruminantium
Etymology: Genus name: named after the German bacteriologist Paul Ehrlich (1854-1915).
Species epithet: of ruminants.
Significance:The disease occurs in Africa and the Caribbean, where it causes serious problems in the livestock sector.
  [Of minor importance]   
Alternative Species Name(s):Cowdria ruminantium
Type Strain: Welgevonden.
Macromorphology (smell): Cannot be cultivated on cell free substrates (e.g. agar plates).
Micromorphology: Coccoid to elipsoid cells (about 0,5 µm i diameter), which are nonmotile. A morula can be up to 4 µm in diameter.
Gram +/Gram -:G-
Metabolism: Aerobic
Fermentation of carbohydrates: Is not used for identification of Ehrlichia spp. Furthermore, many intracellular bacteria lack enzymes for carbohydrate metabolism because of evolutionary gene reduction.
Spec. Char.:
Vector: Tick (Amblyomma variegatum and A. cajennensis).
Reservoir: Ruminants
Disease:Heartwater or cowdriosis.
Hosts: Cattle, sheep, goats and other ruminants.
Clinical Picture:
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_006831 Gardel 1 499 920  

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
X61659 Crystal Springs (Zimbabwe) isolate 1569 

Seven species have been described within the genus Ehrlichia, which is most closely related to the genus Anaplasma.
Comment:Strictly intracellular and grows in inclusions (morulae) in monocytes. Morula refers to the mulberry-like structure (Morus= mulberry in Latin) of the inclusions .


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 VetBact

Published 2023-03-15. Read more...

Recently Updated

Recent blog posts

Most recent comment

Swedish University of Agricultural Sciences