GRID2 and viral encephalitis: In a young boy who had acute encephalitis with refractory, repetitive partial seizures, anti-GluRδ2 antibodies were reportedly present in addition to antibodies to GluRε2/NR2B and antibodies to the glutamate receptor zeta2 (GluRζ1) [60], i.e. the NMDA receptor subtype NMDAR1A or NR1A, the main target in anti-NMDAR receptor encephalitis [61].