Legionella pneumophila


Standard Precautions

General Information

Aerobic small gram negative bacillus

Reservoir is water. Aerosolization by cooling towers, spas, shower heads, etc.

Occurs in outbreaks.

Person-to-person transmission not documented.

  •  Severe pneumonia (Legionnaires disease)

  •  Pontiac fever (Self-limited febrile illness)

  •  Extrapulmonary infections rare, but include endocarditis

Detected via legionella urine antigen test. Can also be detected on bronchial alveolar lavage samples.

Risk factors include:

  • Outbreak setting

  • Older male

  • Smoker

  • Cardiopulmonary disease

  • Renal disease

  • Immunosuppression

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