NYC Legionnaires’ Disease Outbreak Death Toll Rises to Four

A fourth person has died in New York City following a Legionnaires’ disease outbreak on the Upper East Side. Health officials have confirmed 76 total cases since the cluster was identified on July 2.

Casualties and Clinical Status of the Outbreak

New York City Health Department reports fourth fatality

The city’s health department reported the fourth death on Monday, marking the fourth consecutive day that a fatality associated with this cluster has been confirmed. As of Monday evening, seven individuals remained hospitalized due to complications from the illness. City health authorities reported that 60 people had been hospitalized in total, with 53 of those patients having been discharged.

Legionnaires’ disease is a severe form of pneumonia caused by a type of bacteria that thrives in warm, stagnant water. According to the U.S. Centers for Disease Control and Prevention, the disease is treatable, though 10% of people will die due to complications from the illness. City officials have emphasized that while most people exposed to the bacteria do not become ill, the infection can be fatal.

Medical advice for residents in ZIP codes 10028, 10075, and 10128

The city has advised residents who spent time in ZIP codes 10028, 10075, and 10128 to seek medical attention if they develop flu-like symptoms. Symptoms typically develop two to fourteen days after exposure and include fever, chills, muscle aches, shortness of breath, and cough. Legionnaires’ disease can be effectively treated with antibiotics when diagnosed early, the New York City Health Department wrote in a statement.

One victim, an 88-year-old man, was described by his attorney, Ronald Katter, as having been suddenly struck by the illness. It wasn’t as if he has an acute illness that he was suffering for. He was sitting in his apartment by an open window and reading a magazine, and when she came home, he had a 104-degree fever, Katter said.

For more on this story, see NYC Legionnaires’ Disease Outbreak Deaths Rise to Three in Manhattan.

Cooling Tower Inspections and Remediation

Testing of 180 cooling towers identifies 31 positive buildings

City officials identified the outbreak on July 2 and pivoted quickly to investigate cooling towers—key components of large building air conditioning systems—as potential sources. Authorities tested 180 different cooling towers and discovered live or dead Legionella bacteria in 31 buildings. The city noted that the discovery of dead bacteria in some buildings did not necessarily mean individuals in those buildings were exposed to the disease. Property owners were ordered to drain and disinfect towers where positive test results were found.

Iowa Legionnaire's disease outbreak: What are cooling towers?

Guggenheim Museum at 1071 Fifth Ave., as well as 180 East End Ave., 1750 York Ave., 1660 Second Ave., 1438 Third Ave., 1511 Third Ave., 1551 Third Ave., 1080 Fifth Ave., 1001 Fifth Ave., 240 E. 82nd St., 8 E. 83rd St., 145 E. 84th St., 117 E. 85th St., 125 E. 87th St., 152 E. 87th St., 120 E. 87th St., 501 E. 87th St., 168 E. 88th St., 160 E. 88th St., 1875 Second Ave., 1110 Fifth Ave., 153 E. 78th St., 135 E. 79th St., 300 E. 79th St., 238 E. 81st St., 160 E. 84th St., 114 E. 85th St., 401 E. 88th St., 333 E. 91st St., 354 E. 91st St., and 312 E. 95th St.

This follows our earlier report, NYC Health Officials Investigate Legionnaires’ Disease Outbreak in Carnegie Hill.

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. We have also reminded cooling tower operators across the city of their summertime requirement to increase use of biocides that kill Legionella bacteria. Martin

Public Safety Measures and Ongoing Oversight

Mayor Zohran Mamdani pledges aggressive enforcement of health laws

We believe we have now eliminated the source of exposure. Regardless, we will continue to inspect cooling towers and aggressively enforce health laws. I’m heartbroken by the loss of my fellow New Yorkers and send my deepest condolences to their loved ones. Mayor

Officials have sought to maintain public calm, confirming that residents can safely use tap water, bathe, shower, cook, and operate home air conditioning units. The bacteria is not transmissible from person to person, and city officials cautioned that mask-wearing will not help stave off infection. Community cluster outbreaks typically stem from common sources, such as cooling towers, hot tubs, and spray fountains.

Public Safety Measures and Ongoing Oversight
Photo: Abc7chicago
NYC Mayor Zohran Mamdani Asked For Update On Legionnaires Disease Outbreak

Read also: Legionnaires’ Disease Death Reported in New York City.

Dr. Martin added, While we mourn this loss, the data are also encouraging. Our aggressive strategy of testing, enforcement, and remediation appears to have stopped the source of exposure. The city remains in an active enforcement phase, with officials pledging to hold building owners accountable if they fail to comply with public health laws.

Residents are encouraged to consult with qualified medical professionals if they experience symptoms and to check the Health Department’s website for the most up-to-date information.

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