Which bacterium causes Anaplasmosis?

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Anaplasmosis is caused by Anaplasma phagocytophilum, an intracellular bacterium that specifically infects neutrophils and is transmitted to humans by Ixodes tick bites. This makes it distinct from the other organisms listed: Borrelia burgdorferi is the spirochete behind Lyme disease; Rickettsia rickettsii causes Rocky Mountain spotted fever; and Babesia microti is a protozoan parasite that causes babesiosis. Knowing the exact agent helps with recognizing tick-borne illness patterns and guides diagnosis and treatment, typically with doxycycline.