![]() ![]() Outbreaks of Legionnaires' disease receive significant media attention. Some people can be infected with the Legionella bacterium and have only mild symptoms or no illness at all. On Januthe causative agent was identified as a previously unknown bacterium, subsequently named Legionella.Īn estimated 8,000 to 18,000 people get legionellosis in the United States each year. Legionnaires' disease acquired its name in 1977 when an outbreak of pneumonia occurred among people attending a convention of the American Legion in Philadelphia. Pontiac fever is caused by the same bacterium, but produces a milder respiratory illness without pneumonia which resembles acute influenza.Legionnaires' disease is the more severe form of the infection and produces pneumonia.Over 90% of legionellosis cases are caused by Legionella pneumophila, a ubiquitous aquatic organism that thrives in warm environments (25 to 45 ☌ with an optimum around 35 ☌). Legionellosis is an infectious disease caused by bacteria belonging to the genus Legionella.
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