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A) Giemsa-stained thin blood smear for an 8-year-old boy from China showing erythrocytes with typical ring forms, paired pyriforms, and tetrads of a Babesia sp. (arrows). B) Giemsa-stained thin blood smear for a mouse with severely combined immunodeficiency, which had been injected with blood from the patient, showing Babesia sp.–infected erythrocytes (arrows). Original magnifications ×1,000.
