Herpes simplex encephalitis Home A-Z Health Information Health Library A-Z Herpes Simplex Encephalitis Overview Herpes simplex encephalitis refers to a brain parenchyma infection caused due to herpes simplex viral infection. It leads to inflammation and swelling of brain parenchyma and covering of the brain (meninges). Cause Herpes simplex virus infection Risk factors Genetic defects in the Toll-like receptor (TLR3)-interferon (IFN) and IFN-responsive pathwaysChemotherapy and chronic alcoholismHistory of substance abuseA past medical history of sinusitis or psychotic disorders Symptoms FeverHeadacheAltered sensorium- confusion, disorientation, comaNeck stiffnessSeizuresWeakness, nausea, vomitingIf not treated timely and adequately, may prove to be life threatening Specialist to approach Neurologist Diagnosis CSF examination to determine pleocytosisMRI brain to determine contrast enhancement in temporal areas, or vasculitic infarctsEEG to check periodic lateralized discharges.Blood tests for HIV antibodies Treatment Antiviral therapy (acyclovir)Supportive care- management of seizures, fluid replenishment, hydration and calory supplementationICU care may be required