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A 6-year-old, African-American boy presents with fever and pain in his extremities for the last several hours. The pain is unrelated to movement or posture. His pulse is 102/min, blood pressure is 110/70 mm Hg, temperature is 38°C (100.4°F), and respirations are 18/min. Physical examination reveals pallor, jaundice, and splenomegaly. Both lower legs are tender to palpation. Lab tests show the following: Hematocrit 20%, WBC count 13,000/micro-L, Platelet count 180,000/miro-L, Bilirubin 5.0 mg/dL, Direct bilirubin 1.2 mg/dL, Reticulocyte count 11%. Peripheral blood smear shows sickle shaped cells. Hemoglobin electrophoresis confirms the diagnosis of sickle cell anemia. After treating the child with analgesia, hydration, and oxygen therapy, the painful episode subsides. Which of the following measures should be employed to prevent aplastic crisis in this child?

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