Legionellosis is a serious lung infection caused by the bacteria Legionella. This infection is also known as Legionnaires’ Disease. The bacteria are found naturally in freshwater, like lakes and streams. The bacteria can also grow and spread in:

On this page

  • Spread of Legionella
  • Signs and Symptoms of Legionellosis
  • Prevention of Legionellosis
  • Resources for the Public

  • Spread of Legionella

    Legionella bacteria
    Legionella bacteria

    People can get sick when small drops of water with the bacteria get into the air. People then breathe them in and the bacteria gets in their lungs. The bacteria cannot spread from one person to another.
    Most healthy people exposed to the bacteria do not get sick. Being 50 years or older or having certain risk factors can increase your chances of getting sick. These include:


    Signs and Symptoms of Legionellosis

    Signs and symptoms include:

    Other symptoms include diarrhea, nausea, and confusion. Symptoms usually start 2 to 14 days after breathing in the bacteria.


    Prevention of Legionellosis

    Routine home maintenance can prevent growth of the bacteria.


    Resources for the Public