title: Prolonged fever of unknown origin in children.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003095:Collagen Diseases / Q000150:complications; D005260:Female; D005334:Fever / Q000209:etiology*; D005335:Fever of Unknown Origin / Q000209:etiology; D006801:Humans; D007223:Infant; D007239:Infections / Q000150:complications; D007938:Leukemia / Q000150:complications; D008223:Lymphoma / Q000150:complications; D008297:Male; D008659:Metabolic Diseases / Q000150:complications; D012141:Respiratory Tract Infections / Q000150:complications; D012189:Retrospective Studies; D013997:Time Factors