Legionnaires’ disease was first identified following a large outbreak of
pneumonia among people who attended an American Legion Convention
in Philadelphia in 1976. A previously unrecognised bacterium was isolated
from lung tissue samples which was subsequently named Legionella
On average there are approximately 200-250 reported cases of Legionnaires disease each year in the United Kingdom (UK). It is thought, however, that the the total number of cases of the disease may be generally underestimated.