In Germany, the Neuromyelitis optica Study Group (NEMOS) currently collects data on cases of MOG-EM and NMOSD associated with either SARS-CoV-2 vaccination or COVID-19 (www.nemos-net.de), and the German Network for Research on Autoimmune Encephalitis (GENERATE) documents cases of other forms of encephalitis/encephalomyelitis of putative autoimmune aetiology occurring in these settings (www.generate-net.de). The gene discussed is MOG; the disease is erythema multiforme.