Legionnaires' Disease Outbreak Reported on New York's Upper East Side

New York City health officials are investigating a Legionnaires’ disease outbreak on the Upper East Side that has infected 23 people and hospitalized 17. The cluster is centered in ZIP codes 10028, 10128, and 10075, extending to Central Park. While the exact source remains unidentified, the health department is testing and remediating over 160 area cooling towers. Officials urge residents with flu-like symptoms to seek immediate medical care, as the disease is highly treatable with antibiotics.

Upper East Side Legionnaires' outbreak

• ▪As of July 6, 2026, the Upper East Side Legionnaires' disease cluster has resulted in 23 confirmed cases and 17 hospitalizations, with no reported deaths
• ▪The primary affected ZIP codes for the Upper East Side Legionnaires' outbreak are 10028, 10128, and 10075, with the impacted zone also extending to the east side of Central Park from 76th Street to 97th Street
• ▪The New York City Department of Health and Mental Hygiene is investigating a Legionnaires’ disease cluster in the Carnegie Hill and Yorkville neighborhoods of the Upper East Side

Cooling tower bacterial transmission

• ▪New York City health officials stated that residents in the affected area can safely continue drinking tap water, bathing, showering, cooking, and using home air conditioning units
• ▪Legionnaires' disease is a severe type of pneumonia caused by Legionella bacteria, which grow in warm water and spread through water systems like commercial rooftop cooling towers
• ▪Legionella bacteria are typically transmitted when contaminated cooling towers produce a fine water mist or vapor that people breathe in, and the bacteria cannot be transmitted person-to-person

High-risk patient populations

• ▪According to the U.S. Centers for Disease Control and Prevention, approximately one in 10 people who contract Legionnaires’ disease will die from complications
• ▪Individuals face an increased risk for Legionnaires’ disease if they are age 50 or older, smoke or vape, have a chronic lung disease, or have a weakened immune system

Respiratory symptoms requiring treatment

• ▪Health officials advise individuals experiencing respiratory symptoms to seek immediate medical care, as Legionnaires' disease is highly responsive to standard antibiotics but can cause respiratory failure, shock, or organ failure if untreated
• ▪Legionnaires' disease symptoms usually develop two days to two weeks after exposure and include cough, fever, headaches, muscle aches, and shortness of breath

Health department surveillance efforts

• ▪The New York City Department of Health and Mental Hygiene is testing and instructing all buildings with cooling towers in the affected region—comprising over 160 towers—to immediately clean and test for Legionella
• ▪Local doctors in New York City have been instructed to actively screen patients for Legionnaires' symptoms, and officials anticipate more cases will be identified in the coming days
• ▪New York City Council Speaker Julie Menin questioned whether the health department is focusing its investigation on buildings that were non-compliant with a city law mandating testing and cleaning every 90 days

Community town hall meeting

• ▪Health officials scheduled an in-person town hall meeting for July 7, 2026, at 6 p.m. at the Church of Saint Ignatius Loyola on Park Avenue to provide information to residents
• ▪The New York City Department of Health and Mental Hygiene held a virtual town hall meeting on the evening of July 6, 2026, to address community concerns regarding the outbreak