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The Spread of Legionnaires' Disease

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Legionnaires’ Disease cannot be spread from person to person.

Outbreaks occur when two or more people contract the bacteria in the same place at about the same time, most often in hospitals. Hospital buildings have complex water systems, and many patients and employees in hospitals are already subject to illnesses that increase their risk for Legionella infection.

Other situations conducive to the spread of Legionnaires’ Disease have been linked to aerosol sources in the community, or on cruise ships and in hotels.