A 35-year-old previously healthy man presents to the emergency department with a 3-day history of fever, severe headache, and progressive confusion. On examination, he has a temperature of 39.2°C, is disoriented to time and place, and shows focal neurologic deficits with receptive language difficulty. An EEG is performed and shows the pattern marked **B** in the diagram. Which of the following is the most likely diagnosis?
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