All three must be fulfilled: | |
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1 | Subacute onset (< 3 months) of working memory deficits (short-term memory loss), altered mental status (decreased or altered level of consciousness, lethargy or personality change) or psychiatric symptoms |
2 | ≥1 of the following: - New focal CNS findings - Seizures not explained by a previously known seizure disorder - CSF pleocytosis (white blood cell count > 5/μl) - MRI features suggestive of encephalitis |
3 | Reasonable exclusion of alternative causesa |