A 28-year-old menstruating woman appeared in the emergency room with the following signs and symptoms: fever, 104degF (40degC); WBC, 16,000/ uL; blood pressure, 90/65 mmHg; a scarlatiniform rash on her trunk, palms, and soles; extreme fatigue; vomiting; and diarrhea.The patient described in the case above most likely has