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Fever of unknown origin (FUO), pyrexia of unknown origin (PUO) or febris e causa ignota (febris E.C.I.) refers to a condition in which the patient has an elevated temperature (fever) but despite investigations by a physician no explanation has been found.〔 (Mandell's Principles and Practices of Infection Diseases ) 6th Edition (2004) by Gerald L. Mandell MD, MACP, John E. Bennett MD, Raphael Dolin MD, ISBN 0-443-06643-4 · Hardback · 4016 Pages Churchill Livingstone〕〔(Harrison's Principles of Internal Medicine ) 16th Edition, The McGraw-Hill Companies, ISBN 0-07-140235-7〕〔(The Oxford Textbook of Medicine ) Edited by David A. Warrell, Timothy M. Cox and John D. Firth with Edward J. Benz, Fourth Edition (2003), Oxford University Press, ISBN 0-19-262922-0〕〔 (Cecil Textbook of Medicine ) by Lee Goldman, Dennis Ausiello, 22nd Edition (2003), W.B. Saunders Company, ISBN 0-7216-9652-X〕〔(Irwin and Rippe's Intensive Care Medicine ) by Irwin and Rippe, Fifth Edition (2003), Lippincott Williams & Wilkins, ISBN 0-7817-3548-3〕 If the cause is found it is usually a diagnosis of exclusion, that is, by eliminating all possibilities until only one explanation remains, and taking this as the correct one. ==Definition== 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 A new definition which includes the outpatient setting (which reflects current medical practice) is broader, stipulating: *3 outpatient visits or *3 days in the hospital without elucidation of a cause or *1 week of "intelligent and invasive" ambulatory investigation.〔 Presently FUO cases are codified in four subclasses. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fever of unknown origin」の詳細全文を読む スポンサード リンク
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