Legionnaires' diseaseLe·gion·naires' disease
an acute respiratory infection, often resulting in pneumonia, caused by bacteria (Legionella pneumophila) that may contaminate water or soil
Origin of Legionnaires' disease; from legionnaire (sense ): from the first recognized outbreak of the illness at an American Legion convention in 1976
An acute, sometimes fatal respiratory disease caused by a bacterium of the genus Legionella, especially L. pneumophila, and characterized by severe pneumonia, headache, and a dry cough.
Origin of Legionnaires' diseaseSo called because it was first recognized when an outbreak occurred during an American Legion Convention in Philadelphia in 1976.