Fever of Unknown Origin: A Follow-up Investigation of 34 Patients

Abstract
34 patients hospitalized for fever of unknown origin (FUO) were subjected to a follow-up investigation on the average 5 yr after the hospital stay. Two patients had died of a disease related to FUO: one had adenocarcinoma with an unknown primary site and the other a supposed autoimmune disease. In one case the cause of FUO was a periappendicular abscess. A woman continued to have periods of fever with high ESR. In the remaining 30 cases the cause of FUO had apparently been a self-limited, benign disease. In contrast to an earlier series from our clinic, no cases of tuberculosis were revealed.

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