pyrexia of unknown origin
C2CEFR level
78/100Rarity: rare
TechnicalRegister
A prolonged fever without an identified cause despite appropriate initial investigation.
The patient was admitted for a pyrexia of unknown origin work-up after three weeks of fevers.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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