Legionellosis

(Legionnaires' disease, Pontiac fever)

Legionellosis is an infection caused by Legionella bacteria. The illness can be mild or can result in pneumonia. Most cases occur as single, isolated events; however, outbreaks have been noted.

There are two distinct forms of the disease: Legionnaires' disease and Pontiac fever.

Information on this page has been organized into two categories. Please choose one of the following.

Additional Info Group

General Information

Legionellosis fact sheet, P-42066

For Health Professionals

This is a Wisconsin disease surveillance category II disease:

Report to the patient's local public health department electronically, through the Wisconsin Electronic Disease Surveillance System (WEDSS), by mail or fax using an Acute and Communicable Disease case report, F-44151 (Word) or by other means within 72 hours upon recognition of a case.
Information on communicable disease reporting

Wisconsin case reporting and public health follow-up guidelines:

Case Reporting and Investigation Protocol (EpiNet): P-01895 Legionellosis (PDF)
Legionellosis case report form (PDF)

Last Revised: November 1, 2017