Soft Tissue Infection with Fever and Malaise

13 year old athletic and previously healthy male brought to the ED by his father for tactile fever, headache, and malaise. The day before the patient had cut his lower leg on a sharp metallic object while swimming in a local river. Today there was increasing pain, redness, and swelling at the site of the wound. The patient reported feeling progressively ill. Vaccinations are up to date, no known allergies.

At triage the patient presented with T: 37.8°C, HR 115 bpm (normal range for age: 50-100 bpm), and BP of 121/51 mmHg. He appeared tired, showed flushed cheeks and felt warm to the touch. Capillary refill was prompt.
There was a penetrating wound with a diameter of approximately 1 cm just medial the shin-bone of the left lower leg. The surrounding skin was painful to the touch and showed erythema, swelling, and warmth; sero-purulent drainage was present.