There are clinical signs of brain parenchymal damage, and antibody IgM to a definitive virus, or viral nucleic acid, is detected in cerebrospinal fluid and/or serum.Cerebrospinal fluid results of laboratory tests meet international diagnostic criteria for viral encephalitis (Costa and Sato, 2020).Age under 18.At least 1 raw EEG data in the acute phase is obtained. This evidence concerns the gene CD40LG and viral encephalitis.