Q. A 40-year-old man gets admitted to the hospital for a 1-week history of high fever and swollen right leg. He says that a week ago, he was bitten by a spider while he was working on his farm. A day after this incident, he developed a fever and swelling at the bitten site for which he was taking ibuprofen. As the symptoms are worsening, he came to the hospital. His temperature is 101°F (38.3°C), pulse is 98/min, blood pressure is 110/70 mmHg, and respirations are 15/min. Physical examination shows an erythematous swollen right leg extending from the ankle to below the knee. Few ruptured bullae are present over the foot with no active discharge. The leg is warm and tender to the touch. No crepitus present. Popliteal and inguinal lymph nodes are enlarged on the right side.