Erlichiosis and Anaplasmosis
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Ehrlichiosis and anaplasmosis are systemic tick-borne infections caused by obligate intracellular bacteria of the Anaplasmataceae family. Two similar syndromes are recognized:
- Human monocytic ehrlichiosis (HME) caused by Ehrlichia chaffeensis and transmitted by the lone star tick, is endemic to the southern and south central United States.
- Human granulocytic anaplasmosis (HGA), caused by Anaplasma phagocytophilum, is found in the same regions as Lyme disease and shares the same tick vector (Ixodes spp.).