A type of pneumonia caused by the bacteria Legionella Pneumophila. The organism is usually transmitted in contaminated water aerosols. Occupational groups at risk include water system maintenance engineers and workers in air-conditioned buildings although many documented exposures of the general public exist.
Infections with bacteria of the genus legionella. ... (12 Dec 1998) ... 
(le″jә-nel-o´sis) disease caused by infection with Legionella species, such as L. pneumophila.
Type: Term Pronunciation: lē′jŭ-nel-ō′sis Synonyms: Legionnaires' disease