AMPH and viral encephalitis: * The encephalitis/paraneoplastic autoantibody panel includes ANNA1 (HU), ANNA2 (RI), ANNA3, PCA1 (YO), PCA2, PCA TR (DNER), AGNA/SOX1 Glial nuclear type 1, Amphiphysin, CRMP5/CV2, GAD65, MA2/TA, Myelin, AQP4, NMDAR1, AMPAR1, AMPAR2, GABABR, LGI1, CASPR2, DPPX Receptor, and VGKC antibodies.