List of Legionnaires' disease outbreaks

This is a list of Legionnaires' disease outbreaks; Legionnaire's is a potentially fatal infectious disease caused by gram negative, aerobic bacteria belonging to the genus Legionella. The first reported outbreak was during a Legionnaires Convention at The Bellevue-Stratford Hotel in Philadelphia in 1976.

An outbreak is defined as two or more cases where the onset of illness is closely linked in time (weeks rather than months) and in space, where there is suspicion of, or evidence of, a common source of infection with or without microbiological support (i.e. common spatial location of cases from travel history).