Anaplasmosis is caused by which organism?

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Multiple Choice

Anaplasmosis is caused by which organism?

Anaplasmosis is caused by Anaplasma phagocytophilum, a small intracellular bacterium that infects neutrophils and is transmitted by Ixodes ticks. This organism causes human granulocytic anaplasmosis, presenting with fever, malaise, and often cytopenias; diagnosis is supported by PCR or serology, and a blood smear may show morulae inside neutrophils. Among the options, this is the organism classically linked to anaplasmosis. The others cause different diseases: Rickettsia rickettsii causes Rocky Mountain spotted fever, Borrelia burgdorferi causes Lyme disease, and Ehrlichia chaffeensis causes human monocytic ehrlichiosis.

Anaplasmosis is caused by Anaplasma phagocytophilum, a small intracellular bacterium that infects neutrophils and is transmitted by Ixodes ticks. This organism causes human granulocytic anaplasmosis, presenting with fever, malaise, and often cytopenias; diagnosis is supported by PCR or serology, and a blood smear may show morulae inside neutrophils. Among the options, this is the organism classically linked to anaplasmosis. The others cause different diseases: Rickettsia rickettsii causes Rocky Mountain spotted fever, Borrelia burgdorferi causes Lyme disease, and Ehrlichia chaffeensis causes human monocytic ehrlichiosis.

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