Depends on the cause: A fever of unknown origin by the modified petersdorf criteria is defined as a fever of 102 lasting at least 3 weeks with at least one week of medical evaluation and still no diagnosis. Acquisition depends on the cause.
Answered 9/30/2015
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Unknown: As dr. Dretler has suggested, this is a medical definition of a condition which may be due to numerous causes. Usually the best way to resolve this is to be evaluated by an infectious diseases expert.
Answered 12/13/2014
5.9k views
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