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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
Taxonomy:
Phylum
Proteobacteria
Class
Alphaproteobacteria
Order
Rickettsiales
Family
Anaplasmataceae 
Genus
Ehrlichia
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
Catalase/Oxidase:
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 

Taxonomy/phylogeny:
 
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 .
Updated:2015-12-16

News

The revised taxonomy of the mollicutes

The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

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