Fever history and symptoms

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Measurement of Body Temperature in Fever

Variations in Body Temperature

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Fever of unknown origin

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Signs and Symptoms

The elevation in thermoregulatory set-point means that the previous "normal body temperature" is considered hypothermic, and effector mechanisms kick in. The person who is developing the fever has a cold sensation, and an increase in heart rate, muscle tone and shivering in an attempt to counteract the perceived hypothermia, thereby reaching the new thermoregulatory set-point.

  • Influenza-like illness is defined as "fever (temperature of 100°F [37.8°C] or greater) and a cough and/or a sore throat in the absence of a known cause other than influenza."[1] Possible causes include respiratory syncytial virus, rhinovirus, adenovirus, parainfluenza viruses, coronaviruses, and metapneumovirus.[2]
  • Myalgias, when prominent, suggests Dengue fever. When myalgias localize to the calves, low back, or abdomen, consider leptospirosis.
  • Liver and renal failure when present, suggest leptospirosis ("Weil's disease")
  • Vertebral osteomyelitis or spondylitis suggests brucellosis

References

  1. Centers for Disease Control and Prevention (2007). "CDC - Influenza (Flu) - Flu Activity". Retrieved 2007-11-19.
  2. Kelly H, Birch C (2004). "The causes and diagnosis of influenza-like illness". Australian family physician. 33 (5): 305–9. PMID 15227858.
  3. Hurt C, Tammaro D (2007). "Diagnostic evaluation of mononucleosis-like illnesses". Am. J. Med. 120 (10): 911.e1–8. doi:10.1016/j.amjmed.2006.12.011. PMID 17904463.
  4. 4.0 4.1 Babyatsky MW, Keroack MD, Blake MA, Rosenberg ES, Mino-Kenudson M (2007). "Case 35-2007 -- A 30-Year-Old Man with Inflammatory Bowel Disease and Recent Onset of Fever and Bloody Diarrhea". 357 (20): 2068–2076. doi:10.1056/NEJMcpc079029. PMID 18003964.
  5. Mackowiak PA, LeMaistre CF (1987). "Drug fever: a critical appraisal of conventional concepts. An analysis of 51 episodes in two Dallas hospitals and 97 episodes reported in the English literature". Ann. Intern. Med. 106 (5): 728–33. PMID 3565971.

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