Legionnaires' disease Investigations

Icons representing epidemiology, environmental health, laboratory science, and communications, as well as the bacterium Legionella.

About Legionnaires' disease Investigations

Multiple public health teams should be involved in Legionnaires' disease outbreak investigations.
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Approximately 10–15% of people with Legionnaires’ disease will have traveled during their period of possible exposure.

Travel-associated Outbreaks as a Public Health Issue

Investigating travel-associated Legionnaires' disease outbreaks includes special considerations.
Illustration of a healthcare facility and a patient seeking care there.

Investigating Healthcare-associated Cases and Outbreaks

Consider healthcare exposures when identifying potential outbreak sources.
Icons representing a water tower and cooling tower on top of a building, both of which could be the source of community-associated Legionnaires' disease outbreaks.

Public Health Guidance for Community-associated Outbreaks

Investigating community-associated Legionnaires' disease outbreaks includes special considerations.

Environmental Health

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Environmental Assessment and Sampling Resources

Explore our resources for the environmental part of Legionnaires’ disease outbreak investigations.
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Featured

Picture of several free resources available from CDC for download along with a download icon.

Investigation Resources

View all of CDC's resources on investigating Legionnaires' disease cases and outbreaks.
A thumbnail image of the cover of various Legionella investigation publications

Publications

CDC has published several resources to support Legionnaires' disease investigations.

Guidance by topic