A 27-year-old woman with no significant past medical history is seen in the emergency department with high-grade fever, headache, vomiting, and confusion. Her boyfriend mentions that the patient has been acting bizarrely for the past day and describes her having a single episode of an epileptic seizure in the morning. MRI examination of the head shows hyperintense temporal lobe lesions. Which of the following best characterizes the cerebrospinal fluid examination of this patient?

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