<prompt> Which of the following is FALSE regarding the clinical features of Herpes Simplex Encephalitis?Alterations in behaviourOlfactory hallucinationsHemiparesisNone of the above  <response>: There is usually a prodrome of malaise, fever 90, headache 81, and nausea and vomiting 46 lasting for a few days, consistent with a viral infection. On this background, features raising suspicion of encephalitis include the concurrent onset of: Progressive alterations of behaviour 71 Features suggestive of focal epilepsy 67, such as olfactory hallucinations or periods of altered awareness Focal neurological signs 33, such as unilateral weakness Cognitive problems 24, such as difficulty in word finding, memory impairment, or confusion Note: Of the two types of herpes simplex virus HSV-1 and HSV-2, HSV-1 encephalitis is more common in adults, and HSV-2 infection is more common in neonates. Ref: Herpes simplex encephalitis, Mazen Sabah, James Mulcahy,, Adam Zeman ; BMJ 2012;344:e3166 