DefinitionLegionnaires' disease is a lung infection. It is a form of pneumonia. It got its name from an outbreak at the American Legionnaires Convention in 1976.
CausesThis disease is caused by specific bacteria. The bacteria are most often found in sources of standing water. It may be found in cooling towers, HVAC systems, and air conditioners. Legionnaires' disease can be contracted by breathing water vapor from a standing water source that contains the bacteria.
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Risk FactorsFactors that may increase your chance of Legionnaires' disease include:
- Advanced age
- Chronic lung disease
- Weakened immune system
- Kidney failure
- Taking cortisone or other immunosuppressive drugs
- History of organ transplant
SymptomsSymptoms may include:
- Fever (often high)
- Chills and muscle aches
DiagnosisYour doctor will ask about your symptoms and medical history. A physical exam will be done. Your doctor may need pictures of your chest. This can be done with a chest x-ray. Your doctor may need tests of your bodily fluids. This can be done with:
- Urine tests
- Sputum tests
- Blood tests
TreatmentThis disease is usually treated with antibiotics.
PreventionProper design, maintenance, and cleaning of high-risk areas can reduce the risk of spreading the disease. This includes any area with standing water.
Centers for Disease Control and Prevention
National Institute of Environmental Health Sciences
National Institutes of Health (NIH)
Capital Health Nova Scotia
Communicable Disease Control
Arcavi L, Benowitz NL.Cigarette smoking and infection. Arch Intern Med. 2004;164:2206-2216.
Community-acquired pneumonia in adults. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated December 5, 2012. Accessed December 31, 2012.
Legionnaires' disease. Occupational Safety and Health Administration website. Available at: https://www.osha.gov/dts/osta/otm/legionnaires/index.html. Accessed December 31, 2012.
Legionnaires' disease. Patient UK website. Available at: http://www.patient.co.uk/health/legionnaires-disease-leaflet. Accessed December 31, 2012.
Legionella infections. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated December 29, 2012. Accessed December 31, 2012.
Legionella (Legionnaires' disease and pontiac fever). Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/legionella/about/index.html. Updated June 1, 2011. Accessed December 31, 2012.
Top 10 things every clinician needs to know about Legionellosis. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/legionella/clinicians.html. Updated June 1, 2011. Accessed December 31, 2012.
- Reviewer: David L. Horn, MD
- Review Date: 02/2015
- Update Date: 05/02/2014
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