A previously healthy 8-year-old boy has a 3-week history of low-grade fever of unknown source, fatigue, weight loss, myalgia, and headaches. On repeated examinations during this time, he is found to have developed a heart murmur, petechiae, and mild splenomegaly. Which of the following is the most likely diagnosis?

  1.  Rheumatic fever
  2.  Kawasaki disease
  3.  Scarlet fever
  4.  Endocarditis
  5.  Tuberculosis

the answer is below…

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