A 20-year-old man has recently been inducted into the army. Several weeks into basic training, he experiences a severe headache for an entire day. He had been healthy prior to this, noting only a mild sore throat the prior day. He goes to the base physician, who records vital signs of T 39.2 C, P 90/minute, RR 19/minute, and BP 110/70 mm Hg. A lumbar puncture is performed and examination of the cerebrospinal fluid shows 2 RBC's/microliter, 34,000 WBC's/microliter, glucose of 20 mg/dl (serum 75 mg/dL), and CSF protein of 105 mg/dL. Which of the following additional laboratory tests on the CSF would be the most helpful in reaching a diagnosis in this case?

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