equine anaplasmosis
Anaplasmosis is a tick-borne disease caused by the bacterium Anaplasma phagocytophilum (formerly known as Ehrlichia phagocytophila and Ehrlichia equi) that infects white blood cells. It’s commonly confused with Potomac horse fever (PHF), which causes similar signs.

Scientists have determined the Anaplasma organism typically infects horses from late fall to early spring and is spread via Ixodes ticks (deer tick and Western black-legged tick), which also spread Lyme disease. The disease has been reported in the United States, Europe, and Israel. Twenty percent of Ixodes ticks in equine-inhabited areas of the southwestern United States are infected with the organism (Roellig DM, et al. 2012).

Clinical signs can appear in an infected horse one to three weeks after exposure to ticks carrying A. phagocytophilum. Fever is the pri

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