Patient: 13-month-old boy Presenting Complaint: High fever and rash History: The boy’s mother reports that her son had a high fever (up to 39.5°C) for the past 4 days. Despite the fever, he remained active and playful, with no significant cough, vomiting, or diarrhea. This morning, the fever resolved abruptly, but she noticed a pink, non-itchy rash on his chest, back, and abdomen. The rash has started spreading to his neck and arms. There is no history of recent vaccinations or travel. The child has had normal developmental milestones and no significant past medical history. Physical Examination: General appearance: Alert and interactive Vital signs: Afebrile, normal respiratory and heart rate Skin: Maculopapular, blanching rash over the trunk and neck, spreading peripherally Head and neck: No lymphadenopathy, no conjunctivitis Neurological: No focal deficits or signs of meningitis Respiratory and abdominal exams: Normal What is the most likely diagnosis for this child?
