Second person dies in legionnaires’ disease outbreak in New York City

• 01A second person has died from a legionnaires’ disease outbreak in New York City, bringing the total number of deaths to two.
• 02As of Saturday, the outbreak had sickened at least 72 people, with nine patients hospitalized and 50 discharged.
• 03New York City health commissioner Dr. Alister Martin stated that testing, enforcement, and remediation measures had stopped the source of exposure.
• 04City officials directed buildings with initial positive test results to clean and disinfect their cooling towers, and all required buildings have completed this work.
• 05The health department reminded cooling tower operators to increase the use of biocides to kill Legionella bacteria during the summer.
• 06The first confirmed case was identified on July 2, and the health department confirmed an average of more than eight new cases daily through July 8.
• 07New case counts dropped to fewer than one daily between July 10 and July 17.
• 08Tests identified Legionella bacteria in cooling towers on more than 75 Upper East Side buildings, including museums, private schools, and apartment houses.
• 09Legionnaires’ disease has a mortality rate of approximately 10% according to the US Centers for Disease Control and Prevention.
• 10In August 2025, a previous legionnaires’ disease outbreak in Harlem resulted in seven deaths and more than 100 infections.

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New York City health officials reported a second death and confirmed that 72 people had been sickened by a legionnaires’ disease outbreak, primarily affecting the Upper East Side. Health Commissioner Dr. Alister Martin stated that aggressive remediation of cooling towers had eliminated the source of exposure, as new case numbers dropped significantly after early July. Officials continued to enforce compliance with cooling tower disinfection and biocide usage to prevent further infections.