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Differentiating Legionnaires' disease from other diseases

The following conditions must be considered in the differential diagnosis of Legionnaires' disease: DDx [1][2][3][4][5][6][7]

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Mahshid Mir, M.D. [2]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [3] Mahshid Mir, M.D. [4]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [5] Mahshid Mir, M.D. [6]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [7] Mahshid Mir, M.D. [8]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [9] Mahshid Mir, M.D. [10]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [11] Mahshid Mir, M.D. [12]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [13] Mahshid Mir, M.D. [14]

Differential Diagnosis
DDx Alphabetic Order
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
W X
Y Z


Template:WikiDoc Sources

Distinctive features of Legionnaires' disease

Signs and symptoms

  • High grade fever
  • Dry cough
  • Progressive dyspnea
  • Bronchial breath sounds
  • Adult respiratory distress syndrome

Laboratory abnormalities

  • Legionella urinary antigen positive
  • Alveolar consolidation on chest radiograph
  • Lobar consolidation on chest radiograph

Distinctive features of Acute interstitial pneumonia

Signs and symptoms

  • Dry cough
  • Progressive dyspnea
  • Adult respiratory distress syndrome

Laboratory abnormalities

  • Disseminated consolidation on chest radiograph
  • Interstitial infiltrate on chest radiograph
  • Increased uptake on Gallium scan

Distinctive features of Mycoplasma pneumonia

Signs and symptoms

  • Dry cough
  • Pleuritic chest pain
  • Inflammed, opaque, hypomobile tympanic membrane
  • Bronchial breath sounds

Laboratory abnormalities

  • Lymphocytosis
  • Cold agglutinins positive
  • Alveolar consolidation on chest radiograph
  • Interstitial infiltrate on chest radiograph
  • Lobar consolidation on chest radiograph

Distinctive features of Pneumococcal pneumonia

Signs and symptoms

  • Hemoptysis
  • Fine rales
  • Pleuritic chest pain
  • Increased breath sounds
  • Bronchial breath sounds
  • Chest dull to percussion
  • Purulent sputum
  • Shallow respiration
  • Pectoriloquy
  • Increased tactile fremitus
  • Productive cough
  • Egophony
  • High grade fever

Laboratory abnormalities

  • Pleural effusion (exudative)
  • Respiratory alkalosis
  • Parenchymal hyperlucency on chest radiograph
  • Increased uptake on Gallium scan
  • Unilateral diaphragm elevation on chest radiograph
  • Alveolar consolidation on chest radiograph
  • Lobar consolidation on chest radiograph
  • Gram positive diplococci on sputum Gram stain

Distinctive features of Pneumocystis carinii pneumonia

Signs and symptoms

  • Immunosuppressive state
  • Mediastinal emphysema
  • Subcutaneous emphysema
  • Hacking cough
  • Progressive dyspnea


Laboratory abnormalities

  • respiratory alkalosis
  • serum beta-D-glucan elevated
  • chest xray consolidation (alveolar)
  • chest xray localized or lobar consolidation
  • chest xray interstitial infiltrate ( incl. reticulonodular )
  • Increased uptake on Gallium scan

Distinctive features of Pulmonary embolism

Signs and symptoms

Laboratory abnormalities

Distinctive features of Streptococcal pneumonia

Signs and symptoms

Laboratory abnormalities

Distinctive features of Viral pneumonia

Signs and symptoms

Laboratory abnormalities

  1. Ferri, Fred (2011). Ferri's differential diagnosis: a practical guide to the differential diagnosis of symptoms, signs, and clinical disorders. Philadelphia, PA: Elsevier/Mosby. ISBN 978-0323076999.
  2. Siegenthaler, Walter (2007). Differential diagnosis in internal medicine: from symptom to diagnosis. Stuttgart New York: Thieme. ISBN 978-1588905512.
  3. Mesko, Dusan (2002). Differential diagnosis by laboratory medicine: a quick reference for physicians. Berlin New York: Springer-Verlag. ISBN 978-3540430575.
  4. Reeder and Felson's gamuts in radiology: comprehensive lists of roentgen differential diagnosis. Place of publication not identified: Springer. 2014. ISBN 978-1475781229.
  5. Burgener, Francis (2008). Differential diagnosis in conventional radiology. Stuttgart New York: Thieme. ISBN 978-1588902757.
  6. Gattuso, Paolo (2015). Differential diagnosis in surgical pathology. Philadelphia, PA: Saunders/Elsevier. ISBN 978-1455770137.
  7. "DXplain".