About the Disease
Legionella bacteria can cause a serious type of pneumonia (lung infection) called Legionnaires’ disease. Legionella bacteria can also cause a less serious illness called Pontiac fever.
Legionnaires’ Disease Fact Sheet
This one page fact sheet describes what Legionnaires’ disease is, its symptoms, how it spread and treated, and who is at increased risk.
Page last reviewed: March 25, 2021