A Legionnaires’ disease outbreak in New York City has resulted in the first reported death, health officials announced on Friday, July 17, 2026. Authorities have not disclosed the identity, age, or specific details regarding when and how the individual fell ill.

The outbreak, centered on Manhattan’s Upper East Side, has infected at least 67 people and hospitalized dozens, according to data from the city health department. Investigators are actively working to determine the source of the outbreak.

Much attention has been given to the air-conditioning systems atop many large buildings, which can emit water vapor containing Legionella bacteria—the microorganisms responsible for the disease. Tests have detected either living or dead Legionella bacteria in the cooling towers of more than 75 buildings in the Upper East Side, including prominent museums, private schools, and expensive apartment complexes. All these buildings have been ordered to clean, drain, and disinfect their cooling towers.

Legionnaires’ disease is a treatable form of pneumonia but has a fatality rate of about 10%, according to the US Centers for Disease Control and Prevention. Last year, a similar outbreak in New York’s Harlem neighborhood resulted in seven deaths and sickened over 100 people.

City officials began monitoring the current outbreak on July 2, 2026, after two initial infections were reported in the area.

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