Q. A 4-year-old girl, crying incessantly is brought to the emergency room by her mother for a fever and generalized rash for the last 3 days. Her mother states that the symptoms started with a high fever followed by a painful rash. The rash started first in the armpits and rapidly progressed to the face and trunk. No significant drug history is noted other than fever-reducer syrup. The family history shows that her older brother had a history of impetigo 10 days ago. Her temperature is 101.5°F ( 38.6°C), pulse is 110/min, respiratory rate is 18/min and blood pressure couldn’t be measured as the child is screaming in pain. Physical examination shows a widespread tender erythematous rash over her trunk, and neck extending onto the groin and face. Large superficial erosions are noted on her back. The eyes and oral mucous membrane appear normal. There is no evidence of lymphadenopathy. Which of the following statements is true about the disease that the patient is most likely suffering from?