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An 8-year-old girl is brought to the emergency department because of a 2-day history of an intermittent, diffuse abdominal pain. She has also had a nonpruritic rash on her legs and swelling of her ankles for 1 week. Two weeks ago, she had a sore throat, which was treated with oral amoxicillin. Examination of the lower extremities shows non-blanching, raised erythematous papules. The ankle joints are swollen and warm, and their range of motion is limited by pain. Laboratory studies show a platelet count of 450,000/mm3. Test of the stool for occult blood is positive. Which of the following is the most likely diagnosis?
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