Kawasaki disease

A 2-year-old boy comes to the emergency department because of high fever and rash for five days. His pediatrician saw him two days ago and felt his fever and rash were likely due to a non-specific viral infection. Since that appointment, he had been refusing to eat solids and had only been taking sips from his bottle and cups. His temperature is 39.6°C (103.2°F). Examination shows conjunctival injection bilaterally. His tongue is bright red and edematous. His tonsils are small but erythematous and without exudate. There is a 1.5-cm (0.59-in) lymph node along the left anterior cervical chain and a 2-cm (0.79-in) supraclavicular lymph node on the right. He has a diffuse, erythematous maculopapular type rash on his chest, abdomen, and back extending into the groin region. His hands and feet are red and painful to touch. Which of the following is the most likely diagnosis?