14 Cases of Legionnaires' Erupt on Upper East Side

As of July 4, 2026, confirmed cases of Legionnaires' disease on Manhattan's Upper East Side have increased to 14. The outbreak, initially reported with just two cases on Thursday, now impacts three New York City ZIP codes: 10075, 10028, and 10128. Health officials are advising residents in the Carnegie Hill and Yorkville neighborhoods, as well as those who visited the east side of Central Park between East 76th and East 97th Streets, to monitor for flu-like symptoms.

Legionnaires' disease is a severe form of pneumonia caused by inhaling water droplets contaminated with Legionella bacteria, typically originating from manmade water systems like cooling towers. There have been no reported deaths associated with this current cluster. This outbreak follows a similar incident last year in central Harlem, where seven people died and 90 were hospitalized due to a Legionnaires' outbreak linked to cooling towers.