MSRA-1421

A 21-year-old man is brought to the hospital after experiencing a generalized seizure. He complains of feeling ill with a fever and headache for the past 48 hours, and his mother notes that he has been unusually irritable lately. The patient has no prior medical history. During the examination, there is mild nuchal rigidity and hyperreflexia in the lower limbs. A CT scan of the head reveals bilateral hypodensities in the temporal lobes. What is the probable diagnosis?