Inside Collection (Textbook): Images of Memorable Cases: 50 Years at the Bedside
Peripheral blood film from a patient with fever, severe myalgia, thrombocytopenia, and leukopenia.
A tick-borne infectious disease caused by Ehrlichia phagocytophilia, a small, coccoid bacterium with a Gram-negative cell wall. The leukocyte in the image contains a morula (arrow), a mulberry-like cytoplasmic cluster of ehrlichiae.