COVID-19 Community Levels Map Update, September 23, 2022: The Centers for Disease Control and Prevention has listed New Haven, Fairfield, Litchfield, Middlesex, Hartford, Tolland, and Windham Counties in the Medium/Yellow category as part of its COVID-19 Community Levels Map. New London county is listed in the Low/Green categories. Visit the CDC COVID-19 Community Levels Map for updates.

Monkeypox: Please visit our monkeypox webpage for the latest updates.


(Legionnaires' disease, Pontiac fever, and extrapulmonary legionellosis)

Legionellosis includes three clinically distinct illnesses, Legionnaires’ disease, Pontiac fever, and extrapulmonary legionellosis, that are all caused by exposure to Legionella bacteria. Legionnaires’ disease most commonly presents as pneumonia. Pontiac fever is a milder, influenza-like illness, and extrapulmonary legionellosis happens when there is disease outside the lungs, (e.g., heart) and diagnostic testing reveals evidence of Legionella at that site.

About Legionella

Surveillance in Connecticut

Information for Patients and the Public

Information for Healthcare Providers and Facilities

Healthcare-Associated Legionnaires' Disease

Epidemiologic Investigation

Environmental Investigation

Information for Building Owners

Water Management Program 


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Legionella  Legionella Activities





This page last updated 3/19/2021.