Legionnaires’ disease is a type of pneumonia caused by Legionella bacteria. This bacteria is generally found in fresh water. It contaminates tanks of hot water, hot tubs and cooling towers of air conditioners. It is usually caused when a person breathes mist that contains bacteria. It can also take place when contaminated water is aspirated. It doesn’t spread directly from between people and people who are exposed to it do not become infected. read more