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Encephalitis
The red area in this computerized axial tomography (CAT or CT) scan reveals inflammation in the temporal lobe. The cause of this swelling is herpes simplex virus, the same virus responsible for Clive’s illness. Many people carry this virus (it causes cold sores), but herpes encephalitis is extremely rare, affecting as few as 1 in 500,000 people annually (Sabah et al., 2012). Even with early treatment, this brain infection frequently leaves its victims with cognitive damage (Kennedy & Chaudhuri, 2002).
Airelle-Joubert/Science Source