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Legionnaires’ disease outbreak in Harlem leaves at least one dead, 22 others sickened as health officials raise alarm

legionnaires’-disease-outbreak-in-harlem-leaves-at-least-one-dead,-22-others-sickened-as-health-officials-raise-alarm
Legionnaires’ disease outbreak in Harlem leaves at least one dead, 22 others sickened as health officials raise alarm

A New Yorker has died and at least 22 others have been sickened in the Legionnaires’ disease outbreak in Harlem, city health officials said in an alarming update.

The cluster of pneumonia-like illness, initially detected on July 25, has now been identified in several zipcodes across Harlem, the New York City Health Department said Wednesday.

Details were not given on the person who had died.

Harlem Pride celebration under a bridge.

People gather at the Harlem Pride celebration on Saturday, June 28, 2025. Luiz C. Ribeiro for New York Post

Scanning electron micrograph of Legionella pneumophila bacteria in potable water biofilm.

Legionella pneumophila bacteria found in water biofilms in 1999. The pneumonia-like illness was detected in Harlem on July 25. Getty Images

Deputy chief medical officer Dr. Toni Eyssallenne urged any New Yorkers with “flu-like symptoms” to contact their health care provider as soon as possible.

“Legionnaires’ disease can be effectively treated if diagnosed early,” Eyssallenne said.

Legionella colonies illuminated by ultraviolet light.

Legionella colonies illuminated using ultraviolet light. Getty Images

“But New Yorkers at higher risk, like adults aged 50 and older, those who smoke or have chronic lung conditions should be especially mindful of their symptoms and seek care as soon as symptoms begin.”

Map of Manhattan zip codes affected by Legionnaires' disease.

A map of the zip codes affected.

Although potentially deadly if not treated in time, Legionnaires’ disease is not contagious and can be treated with antibiotics, the department said.

The disease is typically transferred through water supplies contaminated with Legionella bacteria that can appear in plumbing systems and find favorable conditions in cooling towers, whirlpool spas, hot tubs, humidifiers and condensers in large air conditioning systems.

Legionella pneumophila bacteria culture on a petri dish.

Legionnaire bacteria on a plate at a lab. There has been an outbreak of the disease in Harlem, NY. Brigitte Stelzer

All operable cooling towers in the area under investigation have been sampled — and the Health Department has ordered building owners with positive results to remediate the issue within 24 hours, officials said.

The areas where cases have been confirmed are in five Harlem zip codes: 10027, 10030, 10035, 10037 and 10039, along with the bordering communities, the health department said.

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