How is Legionnaires disease spread?
There is no evidence for person-to-person spread of the disease. Most people contract Legionnaires’ disease by inhaling mist that comes from a water source (e.g. showers, cooling towers, whirlpool baths) contaminated with Legionella bacteria. In some cases, the disease may be transmitted by aspirating contaminated water. Hot water distribution systems are commonly contaminated with Legionella .
