Monarch Disease Ontology identifier MONDO_0010627 (X-linked lymphoproliferative syndrome) can be described as follows. X-linked lymphoproliferative disease is a hereditary immunodeficiency characterized, in the majority of cases, by an inadequate immune response to infection with the Epstein-Barr virus (EBV). Also known as: Duncan disease, Purtilo syndrome, X linked Lymphoproliferative Syndrome, lymphoproliferative syndrome, X-linked.