Legionnaires' Disease: Symptoms & Signs

Medically Reviewed on 9/10/2019

Legionnaires' disease is a bacterial infection.

Pneumonia is the characteristic illness of Legionnaires' disease. Symptoms and signs include

Other associated symptoms can include

The cough of Legionnaires' disease may either be dry or may produce sputum.

Cause of Legionnaires' disease

The bacteria Legionella pneumophila causes Legionnaires' disease. The bacteria that cause the illness exist in many types of water systems, but they grow well in warm, stagnant water of the type often found in some plumbing systems, hot-water tanks, cooling towers, hot tubs, and evaporative condensers of large air-conditioning systems. The aerosolized mist from these systems contains the bacteria and can spread through an entire building.

Other legionnaires' disease symptoms and signs


Bowel regularity means a bowel movement every day. See Answer

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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.