The east coast has reported two recent cases of Legionnaire's Disease, so named after a 1976 outbreak at an American Legion convention in Philadelphia, where the bacterium was first identified. This bacterial organism is found in damp, unclean ventilation systems' often air-conditioner ducts. The non-contagious pneumonia-like illness is spread through the inhalation of water droplets carried in recycled air. In October 2006, the water supply at Maryland's 1,750-man Roxbury prison was found to be contaminated after a former prisoner came down with the illness. This forced the shut-off of showers and a switch to bottled drinking water in one 200-man unit where tests confirmed the bacterium was present. Legionella bacteria were found in tap water in the unit and in the administration building's air conditioning system. In April 2007, two Massachusetts prisoners were hospitalized with Legionnaire's Disease at MCI-Shirley. Both men fell ill within three days; they were in the same housing unit, which was subsequently isolated. Prison officials responded quickly by flushing the water pipes with superheated water to kill the bacteria. Traces of the disease were also discovered at HMP Bronzefield in Ashford, Middlesex, England in June 2007; no infections were reported.