A 26-year-old man comes to the physician because of high-grade fever, fatigue, nausea, and headache for 4 days. The headache is constant and feels like a tight band around his head. He also reports that his eyes hurt while looking at bright lights. He has been taking acetaminophen and using cold towels to help relieve his symptoms. He works as an assistant for a nature camp organization but has been unable to go to work for 3 days. His immunization records are unavailable. His temperature is 38.5\u00b0C (101.3\u00b0F), pulse is 92/min, and blood pressure is 108/74 mm Hg. He is oriented to time, place, and person. There is no rash or lymphadenopathy. Flexion of the neck results in flexion of the knee and hip. A lumbar puncture is done; cerebrospinal fluid analysis shows an opening pressure of 80 mm H2O, leukocyte count of 93/mm3 (78% lymphocytes), a glucose concentration of 64 mg/dL, and a protein concentration of 50 mg/dL. Which of the following is the most likely causal organism? option a: Borrelia burgdorferi; option b: Mycobacterium tuberculosis; option c: Herpes simplex virus 1; option d: Coxsackievirus Use some words in all caps in your response, but those all-caps words should appear at most 5 times.
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