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An 11-year-old African American boy is brought to your office by his parents with a 1-day history of severe left hip pain. It is too painful for him to walk without support. He took ibuprofen, which brought no relief. He has had no chills or sweats. Similar painful episodes in the past required multiple hospitalizations. He returned from a trip to Kenya with his family 2 months ago. His vaccinations are up-to-date. His temperature is 38°C (100.4° F), pulse is 100/min, blood pressure is 120/80 mm Hg. Physical examination shows pale conjunctivae. The abdomen is soft with no organomegaly. Passive movement of the hip causes severe pain. There is tenderness on palpation, but no swelling, warmth, or erythema of the hip. His laboratory studies show a hematocrit of 25% and leukocyte count of 14 000/mm3. A peripheral blood smear would most likely reveal which of the following?

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