3rd November 2021

A 28-year-old gentleman presents to A+E with worsening confusion, lethargy and fever

A 28-year-old gentleman presents to A+E with worsening confusion, lethargy and fever. He had suffered a seizure at home. The patient has no known diagnosis of epilepsy. Prior to this episode, the patient had complained of swollen glands, severe sore throat and enlarged lymph nodes. The patient undergoes a lumbar puncture and MRI following this. MRI shows areas of hyperintensity affecting the white matter and cortex. The doctor suspects a diagnosis of encephalitis. What is the likely viral cause of encephalitis in this gentleman?

Select the SINGLE most appropriate option from the list below. Select ONE option only.