Fever of Unknown Origin (FUO)
- Classic definition: (Petersdorf and Beson, Medicine, 1961)
- Fever > 38.3°C
- Illness > 3 weeks
- Negative evaluation with hospital workup for > 1 week
- Modern definition:
- Temperature > 38.3°C for > 3 wks duration without a diagnosis despite 2 outpatient visits or 3 hospital days.
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