A 2-year-old boy is brought into the emergency room with a complaint of fever for 6 days and the development of a limp. On examination, he is found to have an erythematous macular exanthem over his body, ocular conjunctivitis, dry and cracked lips, a red throat, and cervical lymphadenopathy. There is a grade 2/6 vibratory systolic ejection murmur at the lower left sternal border. A white blood cell count and differential show predominant neutrophils with increased platelets on smear. Which of the following is the most likely diagnosis?

a. Scarlet fever

b. Rheumatic fever

c. Kawasaki disease

d. Juvenile rheumatoid arthritis

e. Infectious mononucleosis

the answer is below…

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