Powered by


                    Home  |  Forums  |  Humor  |  Advertising  |  Contact
   Ask a Doctor

   News via RSS







   Forum Archives





















   Primary Care






   Other Sections


   Research Tools

   Medical Tutorials

   Medical Software




Back to Infections Symptoms


A. Fever without localizing symptoms, rash or lymphadenopathy

ii. Those with fever beyond 3 weeks (FUO)

Definition: Fever of unknown origin (FUO) is a term applied to a febrile illness with temperatures exceeding >101?F (38.3?C) that is at least 3 weeks' duration and remains undiagnosed after 3 days in the hospital or after 3 outpatient visits. This is further categorized into:

1.    Neutropenic (neutrophils </= 500): check for perianal, periodontal infections and candidemia, aspergillosis.

2.    HIV associated: mycobacterium avium, mycobacterium TB, non-Hodgkin's lymphoma, drug fever and CMV.

3.    Nosocomial FUO: septic thrombophlebitis, clostridium difficile colitis and drug fever.

4.    Classic FUO: infections, malignancies, inflammatory diseases and drug fever.

a.    Infections: account for 1/3 of the causes.

Abscesses account for 1/3 of the causes. Most of these are intra-abdominal as abscesses, abscesses elsewhere are easily diagnosed.

Mycobacterial infections.

CMV, EBV in the young.

Lower urinary tract infections.

Endovascular infections: infective endocarditis, mycotic aneurysms, infected atherosclerotic plaques.

advertisement.gif (61x7 -- 0 bytes)

Are you a doctor or a nurse?

Do you want to join the Doctors Lounge online medical community?

Participate in editorial activities (publish, peer review, edit) and give a helping hand to the largest online community of patients.

Click on the link below to see the requirements:

Doctors Lounge Membership Application

b.    Malignancy: accounts for 1/3 of the causes. Leukemia and hypernephroma releases endogenous pyrogens. Hepatocellular carcinoma and liver metastasis can also present with fever. Atrial myxoma.

c.    Collagen vascular diseases: account for 10%. SLE is an uncommon cause as it is readily diagnosed serologically.

d.    Granulomatous disease without defined etiology (e.g. sarcoidosis).

e.    Miscellaneous: Crohn's disease, familial Mediterranean fever, hypertriglyceridemia, drug related and recurrent pulmonary embolism.

f.    Factitious:

1. Thermometer in the tea cup routine.

2. Self-injection with pyrogenic containing substances.

3. Injection of medication known by the patient to cause fever.

g.    Undiagnosed.

previous.gif (72x17 -- 347 bytes) next.gif (72x17 -- 277 bytes)


 advertisement.gif (61x7 -- 0 bytes)



We subscribe to the HONcode principles of the HON Foundation. Click to verify.
We subscribe to the HONcode principles. Verify here

Privacy Statement | Terms & Conditions | Editorial Board | About us
Copyright 2001-2012 DoctorsLounge. All rights reserved.