A 6-year-old boy is brought to the emergency department by his parents with a 2-day history of fever and headaches. The parents report that he vomited once this afternoon. All of his vaccinations are up-to-date and he has no significant past medical history. His temperature is 38.7°C (102°F). Examination shows mild pharyngeal erythema in addition to neck stiffness. Cerebrospinal fluid analysis reveals the following: Glucose 65 mg/dL, Protein 85 mg/dL, Leukocytes 300/mm³, Differential Neutrophils 15%, Lymphocytes 85%, Red blood cells none. Which of the following infectious agents is most likely to have caused this patient's illness?

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