18-18: Legionella Litigation: How Cases are Won and Lost at the Microbial LevelOutbreaks of Legionnaires disease are well publicized and cases often make their way into court. Determining the source of exposure is a key factor in determining responsibility and involves many disciplines, including engineering, water treatment, epidemiology and microbiology. The microbiology of Legionella in the suspected environmental source is explored through examination of culture results. Ideally, the Legionella bacteria causing the infection