TY - CHAP M1 - Book, Section TI - Fever of Unknown Origin A1 - Steele, Russell W. A2 - Kline, Mark W. PY - 2018 T2 - Rudolph's Pediatrics, 23e AB - The definition of fever of unknown origin (FUO) in an immunologically normal host requires an oral or rectal temperature ≥ 38.0°C (100.4°F) at least twice a week for more than 3 weeks and a noncontributory history and physical examination. FUO should not be confused with fevers of shorter duration variously termed “fever without localizing signs” (< 7 days) and “fever without source” (FWS) (7–14 days). Management of patients with comorbidity factors such as acquired or congenital immunodeficiency, neutropenia, and occurrence of fever during prolonged hospital stays is not considered in the following discussion since the differential diagnosis and evaluation of these patients vary considerably. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/14 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1182933659 ER -