Legionellosis is an infectious disease caused by the gram-negative bacilli, Legionella pneumophila and other species belonging to the genus Legionella. It causes two types of conditions that vary in severity; a mild illness called Pontiac fever and the potentially fatal Legionnaires disease. Both?occur most frequently in elderly patients, people with immunosuppressive conditions?as well with the history of a bronchial disease or exposed to various risk factors such as smoking.

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