Jisho

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Wikipedia definition
1. Fever of unknown originFever 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 but despite investigations by a physician no explanation has been found. If the cause is found it usually is a diagnosis of exclusion, that is, by eliminating all possibilities until only one explanation remains, and taking this as the correct one.
Read “Fever of unknown origin” on English Wikipedia
Read “不明熱” on Japanese Wikipedia
Read “Fever of unknown origin” on DBpedia

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