The diseases associated with COVID-19 hospital admission were in the following diagnostic categories: neuromyelitis optica, clinically isolated syndrome and other specified acute disseminated demyelination, central demyelination of the corpus callosum, myelin oligodendrocyte glycoprotein antibody disease and other specified demyelinating diseases of the CNS and unspecified diseases of the CNS. This evidence concerns the gene OMG and demyelinating disease of central nervous system.