A 15-year-old boy spent most of the summer at the northern Minnesota family cabin on a lake in a densely wooded area.After returning to school in the fall, he was frequently tired and listless with periods of fever and chills.A blood sample taken at the physician's office revealed the following organism.The most likely identification is:

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The diagnosis of babesiosis is made from a Wright-Giemsa-stained thin blood smear.The organisms appear as small, delicate, ring-form trophozoites, about 1 to 2 mm, with a prominent chromatin dot and faintly staining cytoplasm.More mature trophozoites may appear as pyriform organisms in single, double, or the classic tetrad (Maltese cross) formation within the red blood cells.CDC PHIL #5944

A 15-Year-Old Boy Spent Most of the Summer at the Northern