Legionellosis can present as two types of illness: Legionnaires’ (LEE-juh-nares) disease and Pontiac fever. The two illnesses can be diagnosed with similar tests, but are treated differently.

Legionnaires’ disease is a serious type of pneumonia (lung infection) frequently requiring hospitalization, whereas Pontiac fever is a less serious illness that is self-limiting and does not require treatment. People can get sick with Legionnaire's disease or Pontiac fever when they breathe in mist or accidently swallow water into the lungs containing Legionella (LEE-juh-nell-a) bacteria.

Preventing Legionnaires' Disease  (PreventLD Training)

Are You Involved in Water Safety for Buildings?

Take this training from CDC and partners on creating a water management program to reduce risk for Legionnaires’ disease. PreventLD Training aligns with industry standards (ASHRAE 188) on managing risk for Legionella bacteria.

Graphic showing instructor looking at information on a screen.

The training includes templates and other resources.

Register Today!

The training addresses the 7 steps of a Legionella water management program. These 7 steps, outlined in CDC’s Water Management Program toolkit, operationalize the ASHRAE 188 standard for minimizing the risk of Legionnaires’ disease

Module A: Getting Started – Introduction to Legionella
Step 1: Create a Water Management Program Team

Module B: Hazard Analysis
Step 2: Describe the Building Water Systems Using Text and Flow Diagrams
Step 3: Identify Areas Where Legionella Could Grow and Spread

Module C: Hazard Control
Step 4: Decide Where Control Measures Should Be Applied and How To Monitor Them
Step 5:  Establish Ways To Intervene When Control Limits Are Not Met

Module D: Confirmation
Step 6: Make Sure the Program Is Running as Designed and Is Effective (Verification and Validation)
Step 7:  Document and Communicate All the Activities of Your Water Management Program

The training also includes case studies in a healthcare facility and manufacturing facility as well as resources for creating water management program action plans.

Legionellosis Reporting

For Clinical Questions or to Report Suspect Cases, Contact:

The CDPH Disease Reporting Hotline at 312-743-9000

*After hours, weekends, and holidays, call 311 and ask for the communicable disease physician on-call (or 312-744-5000 if outside the City of Chicago).

Consideration for Storage and Shipment Instructions: Legionella Testing At Public Health Laboratories Click Here

Asset Publisher

Legionellosis Contacts

During normal business hours, Monday through Friday (excluding holidays)

Phone: 312-746-6152

Fax: 312-746-6388

Email: karrie-ann.toews@cityofchicago.org

CDPH disease reporting line: 312-743-9000  or call 311 after business hours and ask for the communicable disease physician on-call.