question: Q:A 6-year-old girl is brought to the clinic by her mother with fever, sore throat, and a rash. The patient’s mother says that her symptoms started 3 days ago with a high-grade fever, sore throat, vomiting, and malaise. Twenty-four hours later, she says a rash appeared on the patient’s neck and, over the next 24 hours, spread to the trunk and extremities. The patient’s mother mentions she had a bad sore throat about a week ago but denies any chills, seizures, or sick contacts. The patient has no significant past medical history and takes no current medications. Her birth was uncomplicated, and she has been meeting all developmental milestones. The patient’s vital signs include: pulse 90/min, respiratory rate 20/min, temperature 39.0℃ (102.2℉), and blood pressure 90/50 mm Hg. On physical examination, the patient has a whole-body, erythematous punctate, maculopapular rash, as shown in the exhibit (see image). Oropharyngeal examination shows circumoral pallor and a red tongue. The remainder of the examination is unremarkable. Which of the following is the next best step in the management of this patient?? 
  {'A': 'Rapid antigen test', 'B': 'PCR', 'C': 'Serum CRP and ESR', 'D': 'Supportive treatment', 'E': 'Serology for IgM and IgG antibodies'},