Infectious Disease Book

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Fever of Unknown Origin Causes by Age

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  1. See Also
    1. Fever of Unknown Origin
    2. Drug-Induced Fever
    3. Fever of Unknown Origin Causes
    4. Fever in the Returning Traveler
  2. Causes: Age <6 years old
    1. Infections (65%)
    2. Neoplastic Disease (8%)
    3. Autoimmune Disease (8%)
    4. Miscellaneous (13%)
    5. No Diagnosis (6%)
  3. Causes: Age 6 to 14 years old
    1. Infections (38%)
    2. Neoplastic Disease (4%)
    3. Autoimmune Disease (23%)
    4. Miscellaneous (17%)
    5. No Diagnosis (19%)
  4. Causes: Age >14 years old
    1. Infections (36%)
    2. Neoplastic Disease (19%)
    3. Autoimmune Disease (13%)
    4. Miscellaneous (25%)
    5. No Diagnosis (7%)
  5. Causes: Age >65 years old
    1. Connective tissue disease (30%)
      1. Temporal Arteritis
      2. Polymyalgia Rheumatica
    2. Infection (25%)
    3. Cancer (12%)
    4. No Diagnosis (8%)
    5. Reference
      1. Knockhaert (1993) J Am Geriatr Soc 41:1187

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