Legionellosis is an infection caused by species of the bacterium Legionella, most notably L. pneumophila. At least 46 species and 70 serogroups have been identified. L. pneumophila, an ubiquitous aquatic organism that thrives in warm environments (32°- 45°C) causes over 90% of Legionnaires Disease in the United States.

An inflammatory infection that occurs in the lung.

Legionnaires' Disease as related to Pneumonia