Upper East Side Legionnaires’ Outbreak Claims Third Life in New York City

The New York City Department of Health and Mental Hygiene reported a third fatality linked to the Legionnaires’ disease cluster on Manhattan’s Upper East Side. As of Sunday, officials identified 74 confirmed cases in the Upper East Side community cluster, with eight patients remaining hospitalized. The department noted a sustained decline in new cases, suggesting that the source of exposure has likely been eliminated.

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Legionnaires’ disease, a severe pneumonia caused by Legionella bacteria that thrive in warm, stagnant water, has previously affected New York City. Last year, an outbreak in Harlem resulted in more than 100 illnesses and seven deaths. The current Upper East Side outbreak follows a pattern of investigating building cooling towers as potential reservoirs.

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• Confirmed cases: 72 (initial report) -> 74 (latest count)

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• Deaths: 2 (first reported Friday) -> 3 (reported Sunday)

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• Hospitalized: 8 (as of Sunday night)

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• Affected ZIP codes: 10028, 10075, 10128

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• CDC-cited mortality rate for Legionnaires’ disease: ? 10 %

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• Prior Harlem outbreak (2023): > 100 sick, 7 deaths

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Health Commissioner Dr. Alister F. Martin expressed deep sorrow over each loss and urged residents in the affected ZIP codes to seek medical attention for flu-like symptoms. The department continues to test and, where positive, order the draining and disinfection of cooling towers in large buildings. Officials reported no “concerning trends” in emergency surveillance data and emphasized ongoing inspections of all towers that previously tested positive for Legionella.

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• “We are heartbroken to learn that another New Yorker has lost their life to Legionnaires' disease on the Upper East Side. Our deepest condolences are with their loved ones as they grieve,” — Dr. Alister F. Martin, NYC Health Commissioner

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• “It is with great sadness that I report a third person has died in connection with the Legionnaires’ disease community cluster on the Upper East Side. Our hearts are with their family and friends as they mourn their loss,” — Dr. Alister F. Martin, NYC Health Commissioner

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• “Martin said that investigators have not noticed “any concerning trends” in data from emergency surveillance.” — Dr. Alister F. Martin, NYC Health Commissioner

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• “Property owners have been ordered to drain and disinfect towers where there has been a positive test result.” — NYC Department of Health and Mental Hygiene statement

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