A 19-year-old woman presents to the emergency department for…

A 19-year-old woman presents to the emergency department for worsening myalgias, chills, nausea, and generalized weakness. Her symptoms began approximately 5 days ago. She denies any recent travel history or sick contacts and states she is currently menstruating and using tampons. Her temperature is 102.0°F (38.9°C), blood pressure is 88/55 mmHg, and pulse is 115/min. Physical examination is remarkable for confusion and widespread macular blanching erythroderma that appears like a sunburn. Laboratory studies are significant for a leukocyte count of 17,000/mm3 with a neutrophilic predominance. Blood and urine cultures are obtained. What empiric antibiotic treatment regimen is recommended before culture results?