Legionellosis is an infection caused by Legionella bacteria. There are two types of legionellosis: Legionnaires’ disease and Pontiac fever. Legionnaires’ disease is a serious lung infection, or pneumonia. Pontiac fever is a more mild illness. People can get sick with legionellosis when they breathe in water droplets that contain the bacteria.
The number and rate of reported legionellosis cases has been increasing.
Legionella bacteria grow naturally in water and can grow and spread in a water system if the system is not property maintained. Outbreaks of legionellosis are most commonly associated with large or complex water systems (e.g., hospitals, long-term care facilities, hotels).
In 2017, public health officials investigated a large outbreak of legionellosis linked to a hotel aquatics facility in western Tennessee. To learn more about this investigation, visit: https://www.cdc.gov/mmwr/volumes/67/wr/mm6702a5.htm.
Legionella Webinar Series:
The Tennessee Hospital Association, Tennessee Healthcare Engineering Association, and Tennessee Department of Health developed the "Legionella Webinar Series" to raise awareness about Legionnaire's disease and the importance of prevention through water management programs. Recorded webinars and presentations can be found below.
Introduction to Healthcare-Associated Legionellosis
Water Management Programs
Developing a Water Management Program
Healthcare Experience with Water Management Programs
What to Expect in an Outbreak
Review Resources and Healthcare Implications
SharePoint Toolkit (for public health)
TDH Reportable Disease Information: https://www.tn.gov/health/cedep/reportable-diseases/legionellosis.html
CDC Information: https://www.cdc.gov/legionella/index.html