Fever in Adults (cont.)
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Synonyms and Keywords
fever in adults, fever in children, cold, flu, chills, flushed, overheated, warm, viral fever, bacterial fever, fungal fever, animal exposure fever, travelers' fever, drug fever, blood clot fever, tumor fever, environmental fever, ibuprofen, acetaminophen
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Fever of unknown origin (FUO) was defined in 1961 by Petersdorf and Beeson as the following: (1) a temperature greater than 38.3°C (101°F) on several occasions, (2) more than 3 weeks' duration of illness, and (3) failure to reach a diagnosis despite one week of inpatient investigation.