GAD2 and encephalitis: More and more cases such as glutamic acid decarboxylase (GAD) 65 antibody encephalitis [20], the voltage-gated potassium channel (VGKC) complex antibody encephalitis [21] (including LGI1 and Caspr2 antibodies), N-methyl-D-aspartate receptor (NMDAR) antibody encephalitis [22], alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) [23], and gamma aminobutyric acid receptor GABA(B) antibody encephalitis [24] are recognized.