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ehrlichiosisIt was known for years that certain species (some believe them to be variant strains of a single species) can cause disease in animals, for example E. canis in dogs and E. phagocytophila in sheep and cattle. In the mid-1980s human ehrlichiosis was first recognized. The causative agent was found to be E. chaffeensis. This form is now known as human monocytic ehrlichiosis. In 1990 another form of the disease, human granulocytic ehrlichiosis, was identified. The Ehrlichia organisms invade various white blood cells (see blood; immunity). E. chaffeensis invades monocytes; granulocytic Ehrlichia invades granulocytes.
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Anaplasma phagocytophilum. A. phagocytophilium is endemic to New England and the north...more »
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