familial hemophagocytic lymphohistiocytosis type 1 https://github.com/monarch-initiative/mondo/issues/6748 https://github.com/monarch-initiative/mondo/issues/6752 https://www.malacards.org/card/hemophagocytic_lymphohistiocytosis_familial_1 hemophagocytic lymphohistiocytosis, familial, 1 MEDGEN:1642840 familial hemophagocytic lymphohistiocytosis Editor note: type 1 split out. This term's classification was reviewed in the context of the Strategic Refinement project (2023) and was determined to be excluded from the 'inflammatory disease' (MONDO:0021166) ontology branch (https://orcid.org/0000-0003-4830-7530, https://orcid.org/0000-0001-9310-0163). DOID:0110921 familial hemophagocytic lymphohistiocytosis type 1 Familial Hemophagocytic lymphohistiocytosis (FHL) is a rare primary immunodeficiency characterized by a macrophage activation syndrome with an onset usually occurring within a few months or less common several years after birth. familial HLH NCIT:C61276 OMIM:267700 UMLS:C4551514 HPLH1 MONDO:0009974 FHL1 MedDRA:10070904 HLH1 GARD:0006590 hereditary hemophagocytic lymphohistiocytosis hereditary neurological disease