||Gemus name: the new rickettsia. Species epithet: named after Miodrag Ristic.|
|Significance:||The disease is common in some regions of the United States, Canada and South America. Has also been detected in France and Italy, but never in Sweden. However, it may occur in horses imported from the United States.
[Of minor importance]
|Old Species Name(s):||Ehrlichia risticii|
||Illinois = HRC-IL = ATCC VR-98.|
||Cannot be cultured on cell free substrates (for instance agar plates)
||Small (0.8 x 1.5 µm) nonmotile coccoid rods
|Gram +/Gram -:||G-, is normally not gram stained. Lymph node aspirate can be stained by Giemsa or Machiavello-staining, which gives blue and red bacteria, respectively.
|Fermentation of carbohydrates:
||Is not used for identification of Neorickettsia spp. Furthermore, many intracellular bacteria lack enzymes for carbohydrate metabolism because of evolutionary gene reduction.
||Horse, (cattle, mouse, dog and cat)|
||Liver fluke (Fasciola gigantica)|
||Insects infected by the liver fluke|
|Disease (Swedish):||Monocytär "ehrlichios" hos häst.
|Disease (English):||Potomac horse fever or equine monocytic ehrlichiosis or equine scours.|
||Acute watery diarrhea. Abortion if the fetus is infected (rare).|
|CP001431 ||Illinois ||0 879 977
||1c + 0 |
|16S rRNA Seq.:
|Acc-no||Strain||Number of NT||Operon|
|M21290 ||(T) ||1498 ||1 |
||Three species have been described within the genus, which is most closely related to the genera Rickettsia and Wolbachia .
|Comment:||Intracellular and infects mononuclear leucocytes|