Tick-borne emerging infection caused by bacteria from Anaplasmataceae family ( Ehrlichia and Anaplasma genera).
All 3 types of human ehrlichioses are nationally notifiable diseases.
Seasonality is due to higher likelihood of tick exposure/bite when people spend more time outdoors.
Presumptive diagnosis is made in patients with potential tick exposure/demonstrated tick bite combined with fever and other characteristic constitutional symptoms plus leukopenia and/or thrombocytopenia and elevated LFTs.
Treatment with either a tetracycline antibiotic or rifampin should be started immediately.
Ehrlichiosis is a tick-borne emerging infection of white blood cells that is caused by 3 different gram-negative bacteria from the Anaplasmataceae family: Ehrlichia ewingii , E chaffeensis , and Anaplasma phagocytophilum . The type of ehrlichiosis that develops depends on the infecting bacteria and includes human monocytotropic/monocytic ehrlichiosis (HME), human granulocytotropic/granulocytic anaplasmosis (HGA), and human ewingii ehrlichiosis (HEE). The clinical manifestations of each type are generally the same. This monograph deals with human infection only.
Department of Pathology
University of Texas Medical Branch
JPO is the author of a number of references cited in this monograph.
Associate Professor of Pediatrics
West Virginia University School Of Medicine
LSN declares that she has no competing interests.
London School of Hygiene and Tropical Medicine
RR declares that he has no competing interests.
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