mrcem2-0918

A 25-year-old woman presents with a 5-day history of a painful throat, high temperature, diarrhea, and muscle aches. Her temperature today is 38.6°C. Approximately 8 months ago, she began misusing intravenous drugs and acknowledges sharing needles. During the examination, you confirm the existence of lymph node swelling in the neck and armpits. Additionally, she has developed a widespread rash consisting of small raised bumps on her chest and abdomen.

Select from the options below the most probable diagnosis.