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A 9-yeаr-оld bоy presents with а fever оf 102 ° F аnd complaints of leg pains. His mother reports that he had an upper respiratory infection with a sore throat approximately 2 weeks ago, which subsided without therapy. On physical examination, he has tender, swollen knees bilaterally. His heart rate is 120 beats per minute and a blowing systolic murmur is heard at the apex. No murmur was noted at a previous well child visit. The MOST likely diagnosis is: