Khan et al. (2021) and Peters et al. (2021) reported a case of MOGAD following COVID-19 infection. Mbonde et al. (2021) reported a well-controlled human immunodeficiency virus (HIV)-positive patient with bilateral parotid swelling and myelitis who was found to be double positive for MOG-IgG and mumps-IgG. This evidence concerns the gene MOG and myelitis.