A Medline search (“[covid or covid-19 or SARS or SARS-CoV-2] and encephalitis and MOG”) conducted on 27 August 2021 yielded only two results (cited as refs. [14, 15] and discussed above), both published in 2021, and one review citing one case of MOG-associated myelitis. This evidence concerns the gene MOG and viral encephalitis.