Legionnaires' disease Investigations

Homepage for CDC's information on investigating cases and outbreaks associated with Legionella.

This content is for informational purposes only. Always consult a healthcare professional.

Source: Centers for Disease Control and Prevention — Content from the Centers for Disease Control and Prevention (public domain).

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

Legionnaires’ disease Investigations

Multiple disciplines of public health need to be involved in Legionnaires’ disease investigations.

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Apr. 17, 2024

Travel-associated Outbreaks

Investigating travel-associated Legionnaires’ disease outbreaks includes special considerations.

Investigating Healthcare-associated Cases and Outbreaks

Consider healthcare exposures when identifying potential outbreak sources.

Community-associated Outbreaks

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

Environmental Health

People taking water samples next to a hot tub.

Environmental Resources

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

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Apr. 17, 2024

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.

Apr. 17, 2024

A thumbnail image of the cover of various Legionella investigation publications

Publications

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

Apr. 17, 2024

Guidance by topic

  * [Data Methodology](</investigate-legionella/php/data-research/index.html>)

Legionellosis, which includes Legionnaires’ disease, is a nationally notifiable disease.

  * [Outbreak Investigations](</investigate-legionella/php/public-health-strategy/investigations.html>)

Legionnaires’ disease outbreak investigations require careful planning and periodic reassessments.

  * [Environmental Sampling](</investigate-legionella/php/public-health-strategy/environmental-sampling.html>)

Learn more about environmental sampling for Legionella.

  * [_Legionella_ Testing and Specimen Collection](</investigate-legionella/php/public-health-strategy/legionella-testing.html>)

Testing environmental and clinical samples for Legionella can help confirm an outbreak’s source.

  * [Communication Plans](</investigate-legionella/php/public-health-strategy/communication-resources.html>)

There are special communication considerations during Legionnaires’ disease outbreaks.

⚠ Caution
Medical Disclaimer: This information is for educational purposes only. Always consult a healthcare professional for medical advice.