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Legionella pneumophila History In 1976 an outbreak of pneumonia, caused by the organism L. pneumophila, struck a group of elderly men attending an American Legion Convention in Philadelphia Pennsylvania. The source of the bacterium suggested that contamination came from an environmental air source. The organism was first isolating and identified a year later by Joseph McDade a CDC microbiologist. McDade observed L. pneumophila in a section of liver from a guinea pig that had been inoculated with Legionnaires’ disease.