MOG and viral encephalitis: The following cases and episodes were also excluded: (i) episodes without encephalitis; (ii) cases with positive tests for antibodies other than anti-NMDAR and anti-MOG antibodies; (iii) episodes in which pretreatment specimens were not simultaneously positive for anti-NMDAR and anti-MOG antibodies; (iv) episodes in which steroids were not used in the acute phase; and (v) episodes lacking information on response to acute-phase treatment and follow-up.