Legionnaires’ Disease Cluster in NYC: What You Need to Know

New York City health officials are investigating a cluster of 23 Legionnaires’ disease cases in the Upper East Side, resulting in 17 hospitalizations but no deaths. The disease, caused by Legionella bacteria in mist, does not spread person-to-person. Residents can safely use tap water; however, symptoms like cough and fever should prompt immediate medical attention.

July 7, 2026

•

1–2 minutes

Sources and References

Balzer, Deb. “Mayo Clinic Minute: What to Know About Legionnaires’ Disease.” Mayo Clinic News Network, Mayo Clinic, 7 August 2024, https://www.youtube.com/watch?v=N0_LtcERqe8.

New York City Department of Health and Mental Hygiene. “Legionnaires’ Disease.” NYC Health, updated 6 July 2026, https://www.nyc.gov/site/doh/health/health-topics/legionnaires-disease.page.

New York City Department of Health and Mental Hygiene. “NYC Health Department Investigating Community Cluster of Legionnaires’ Disease on the Upper East Side.” NYC Health, 2 July 2026, https://www.nyc.gov/site/doh/about/press/pr2026/nyc-health-dept-investigating-legionnaires-cluster-ues.page.

Centers for Disease Control and Prevention. “How Legionella Spreads.” CDC, 9 June 2025, https://www.cdc.gov/legionella/causes/index.html.

Centers for Disease Control and Prevention. “Controlling Legionella in Cooling Towers.” CDC, 3 January 2025, https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html.

Centers for Disease Control and Prevention. “Legionellosis Surveillance and Trends.” CDC, 1 December 2025, https://www.cdc.gov/legionella/php/surveillance/index.html.