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- $Unique_ID{BRK02322}
- $Pretitle{}
- $Title{What Is a Fever of Unknown Origin or "FUO"?}
- $Subject{bacterial infection infections ill defined symptom symptoms immune
- system fever unknown origin fevers fuo ufo blood temperature temperatures
- hyperpyrexia}
- $Volume{N-7}
- $Log{}
-
- Copyright (c) 1992,1993 Tribune Media Services, Inc.
-
-
- What Is a Fever of Unknown Origin or "FUO"?
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-
- QUESTION: Can you please explain the use of the letters "FUO" in describing
- an illness. I am sure it has nothing to do with "UFO" but my curiosity has
- been provoked, and I hope you will be able to provide me with the answer I
- seek. Thank you for your help.
-
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-
- ANSWER: "FUO" stands for Fever of Unknown Origin, not for UFO or Unknown
- Flying Objects. In this age of superb diagnostic abilities on the part of
- physicians and relatively new aids to diagnosis--such as CT scans, magnetic
- imaging and a whole host of other laboratory tests, there are fewer fevers for
- which the cause cannot be determined. Yet, some FUO's occur. They can be of
- real concern especially in older patients, the poorly nourished and in those
- whose bodies have decreased natural abilities to fight disease.
- FUO's are fevers (temperatures elevated above the normal) that last for
- several weeks and for which patients and their doctors can find no cause.
- Medically, before a patient is diagnosed as suffering from FUO, three points
- must exist: (1) fever must have lasted for one to three weeks; (2) body
- temperature must have been greater than 101 F on several occasions; and (3)
- diagnosis of the cause of the fever has not been possible after one week.
- Normal human body temperature ranges from 96.8 to 100.4 F; the lowest
- daily temperatures usually occur in the early morning upon awakening, while
- the highest are found in the late afternoon or early evening, and following
- exercise. Persons whose usual body temperature is at the upper end of the
- range and in whom temperatures are taken late in the afternoon may appear to
- have a low fever when, for them, it is really normal.
- Yet, when a fever for which no cause can be found persists for several
- weeks, the sufferer and his/her doctors often become quite anxious.
- Through careful diagnostic procedures, many and possibly most, FUO's
- prove to be caused by some sort of bacterial infection (possibly tuberculosis,
- gonorrhea, appendicitis, abscessed teeth, fungus, or sinusitis to name but a
- few). In addition there are certain virus-caused illnesses, tumors,
- connective tissue diseases (partial list includes: lupus, rheumatic fever,
- and rheumatoid arthritis), endocrine diseases (certain thyroid malfunctions
- among them), alcohol, drugs (both those prescribed to treat other conditions
- and those that are illegal), and/or psychological conditions.
- Among people most prone to FUO's are: the elderly, travelers, recent
- immigrants, homosexuals, patients who have undergone surgery recently, those
- at risk for AIDS, and those who bodies cannot fight disease in a normal way
- because of illness or treatment (such as cancer and chemotherapy).
- Nevertheless, whatever the reasons, prolonged fevers are serious and are
- cause for concern. Young patients who are otherwise healthy, but with fevers
- slightly above the normal range that continue for sometime with no detectable
- reason even after a full series of diagnostic tests, usually do relatively
- well in spite of their FUO's. Some of these fevers disappear in time; in
- others, fevers continue on and off over long periods of time without
- developing into a serious disease. Such patients usually remain under close
- medical observation, to be sure that the situation is not the beginning of
- another, treatable infection.
-
- ----------------
-
- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
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-