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Ehrlichiosis is a tick-borne

bacterial infection, caused by bacteria of the family Anaplasmataceae, genera Ehrlichia and Anaplasma. These obligate intracellular bacteria infect and kill white blood cells.

The average reported annual incidence is on the order of 2.3 cases per million people.

Five (see note below) species have been shown to cause human infection:

Anaplasma phagocytophilum causes human granulocytic anaplasmosis. A. phagocytophilum is endemic to New England and the north-central and ...