X-Linked Immunodeficiency 74, also known as immunodeficiency 74, covid-19-related, x-linked, is related to severe covid-19 and japanese encephalitis. An important gene associated with X-Linked Immunodeficiency 74 is TLR7 (Toll Like Receptor 7), and among its related pathways/superpathways are Infectious disease and Innate Immune System. Affiliated tissues include myeloid and b cells, and related phenotypes are renal/urinary system and immune system