Ehrlichia ewingii
| Ehrlichia ewingii | |
|---|---|
| Scientific classification | |
| Domain: | Bacteria |
| Phylum: | Proteobacteria |
| Class: | Alphaproteobacteria |
| Order: | Rickettsiales |
| Family: | Anaplasmataceae |
| Genus: | Ehrlichia |
| Species: | E. ewingii |
| Binomial name | |
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Ehrlichia ewingii |
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Ehrlichia ewingii is a species of rickettsiales bacteria. It has recently been associated with human infection, and currently has no serological test. The name Ehrlichia ewingii was proposed in 1992.
The current classification is Bacteria, Proteobacteria, Alphaproteobacteria, Rickettsiales, Anaplasmataceae, Ehrlichia ewingii. Classification of different members of the Ehrlichia genus has been disputed, however, it is generally agreed that close relatives of Ehrlichia ewingii are Ehrlichia chaffeensis and Ehrlichia canis. It is also closely related to Wolbachia, Anaplasma, and Neorickettsia bacteria, with Rickettsia as a more distant genus.
Species in the Anaplasmataceae family have unique characteristics that can help differentiate them from other families including: sensitivity to mechanical stress, changes in osmolarity, and thawing. All Ehrlichia sp. are gram-negative and spherical with a rippled outer membrane that shows no peptidoglycan layer or any lipopolysaccharides.
In 1971 Ewing et. al detected a new Ehrlichia strain, which was thought of as another Ehrlichia canis strain. Ehrlichia canis is usually found in lymphocytes and monocytes, but this new strain was found in granulocytes. Due to the variable location, this strain was called Canine Granulocytic Ehrlichia (CGE).
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