Fever of unknown origin diagnostic criteria

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Diagnostic Criteria

In 1961 Petersdorf and Beeson suggested the following criteria:

• Fever higher than 38.3°C (101°F) on several occasions
• Persisting without diagnosis for at least 3 weeks
• At least 1 week's investigation in hospital