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Related to Legionnaire disease: cooling tower, pneumonia, legionella, Pontiac fever, Legionellosis


disease caused by infection with Legionella species, such as L. pneumophila.

Le·gion·naires' dis·ease

an acute infectious disease, caused by Legionella pneumophila, with prodromal influenzalike symptoms and a rapidly rising high fever, followed by severe pneumonia and production of usually nonpurulent sputum, and sometimes mental confusion, hepatic fatty changes, and renal tubular degeneration. It has a high case-fatality rate; acquired from contaminated water, usually by aerosolization rather than being transmitted from person-to-person.
Synonym(s): legionellosis
[American Legion convention, in Philadelphia in 1976, at which many delegates were so affected]


A disease caused by infection with a Legionella bacterium.
Mentioned in: Legionnaires' Disease