OMG and viral encephalitis: Two of them were anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis(the titer in cerebrospinal fluid were 1:100 and 1:,320 respectively); one was voltage-gated potassium channel complex (VGKC) antibody-mediated encephalitis; another case was anti-NMDA antibody combined with myelin oligodendrocyte glycoprotein (MOG) antibody encephalitis.