A third person has died following a Legionnaires’ disease outbreak on Manhattan’s Upper East Side, according to health officials. This latest fatality follows the deaths of two other individuals linked to the cluster, which has sickened at least 72 people since it was first identified on July 2. While the outbreak has caused significant alarm, New York City health officials report that evidence suggests the source of the bacteria has likely been eliminated
due to an aggressive remediation strategy.
Health Department Confirms Three Fatalities on the Upper East Side
Health Department Confirms Fatalities and Outbreak Timeline
New York City health officials announced the first death associated with the outbreak on Friday, followed by a second death on Saturday. By Sunday, officials confirmed a third person had died. While the city has not released the identities or specific ages of all the deceased, the outbreak has reached at least 72 confirmed cases. As of the most recent reports, nine people remain hospitalized, while 50 individuals have been discharged after receiving treatment.
The city began tracking the outbreak on July 2, following reports of two initial infections. The health department confirmed an average of more than eight new cases daily through July 8. Following the implementation of city interventions, the number of new cases dropped to fewer than one daily between July 10 and July 17.
Attorney Ron Katter Links Second Victim’s Death to Cooling Tower Negligence
Details of the Second Victim and Legal Response
On Sunday, new details emerged regarding the second individual to die in the cluster. His attorney, Ron Katter, stated the man fell ill on July 2, when his wife found him near an open window with a 104-degree fever.
For more on this story, see NYC Health Officials Investigate Legionnaires’ Disease Outbreak in Carnegie Hill.
Describing the medical intervention, Katter said, He was intubated and on a respirator and was also having bedside dialysis as well, you know, intravenous, antibiotics administered. And I think they were monitoring his brainwaves.
Despite efforts by an ICU team over two weeks, the man passed away on July 17. Katter explicitly attributed the tragedy to a failure in building maintenance, stating, I blame the property owner who failed to maintain their cooling tower because aside from being city regulations that require cooling tower owners to inspect and clean and sanitize as necessary.
Commissioner Alister F. Martin Mandates Disinfection of 76 Cooling Towers
Cooling Tower Inspections and Containment Strategy
The investigation has centered on the air-conditioning systems atop many large buildings on the Upper East Side, which can release water vapor carrying the Legionella bacteria. City health department data shows that tests have identified either living or dead bacteria in cooling towers on more than 75 buildings, including museums, private schools, and residential apartment houses. In response, the city ordered a total of 76 buildings to clean, drain, and disinfect their cooling towers.
This follows our earlier report, Legionnaires’ Disease Outbreak in New York: Museum Traces Spark US Health Alert.
Dr. Alister F. Martin, the New York City health commissioner, stated that an aggressive strategy of testing, enforcement and remediation
appears to have stopped the source of exposure. We directed every building with an initial positive test result to immediately clean and disinfect its cooling tower, and every one has completed that work,
Martin said. Additionally, the city has reminded cooling tower operators of their summertime requirement to increase the use of biocides to kill the bacteria.
CDC Identifies Bacterial Proliferation Risk in Warm Water Systems
Disease Transmission and Historical Context
Legionnaires’ disease is a form of pneumonia caused by bacteria that grow in warm water and can proliferate in cooling towers, hot tubs, and showerheads. According to the U.S. Centers for Disease Control and Prevention, the disease is treatable but kills about 10% of patients. It does not spread from person to person; individuals contract it by inhaling tiny droplets of contaminated water.
Read also: NYC Legionella Outbreak: Positive Cooling Tower Tests More Than Double.
The name of the disease originates from a 1976 outbreak in Philadelphia, which largely affected people attending a state convention of the American Legion, a war veterans’ non-profit organization. The current situation in Manhattan follows a previous outbreak in August 2025, when seven people died and more than 100 were sickened in New York’s Harlem neighborhood. As the city continues to monitor the current cluster, Commissioner Martin stated, We will continue inspecting every cooling tower that tested positive and will hold accountable any owner who fails to comply with our public health laws.
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