system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 14-year-old girl presents with fever, headache, and muscle aches that have lasted for 2 days. She also complains of malaise and pain in her joints. She says she just returned from a camping trip in Delaware. Her past medical history is not significant. The patient denies any recent sick contacts. Her temperature is 38.3°C (101.0°F), pulse is 87/min, respirations are 17/min, and blood pressure is 120/78 mm Hg. On physical examination, there is a 3-inch-diameter, red, erythematous, round rash with central clearing on the right leg (see image). Antibodies against Proteus vulgaris OX-19 are absent. Which of the following is the most likely cause of this patient’s symptoms?
assistant
Borrelia burgdorferi  