Legionnaires' disease outbreak on Upper East Side expands again: What to know
Jul 13, 2026
Another town hall is planned Monday to discuss the growing Legionnaires’ disease outbreak on the Upper East Side, a day after health officials added new cases to the toll.
As of Sunday night, there were 59 known cases linked to the Upper East Side cluster, according to the health department. F
ifteen patients remain hospitalized.
No one has died, though NYC City Council Speaker Julie Menin, who has criticized the city’s handling of the outbreak, says it’s only a matter of time, given the vulnerable senior population in that zone. Health officials haven’t released information about the ages or potential underlying conditions of those most sick.
NYC Mayor Zohran Mamdani, who faced questions about the outbreak at unrelated press conferences last week, was asked about it at another one Monday. Both he and Menin live in the impacted area.
The mayor urged anyone with symptoms to contact a health care provider. He also said he is aware of independent testing regarding Legionnaires’ cases on the Upper West Side, but says that investigation is unrelated to the Upper East Side cluster. There’s no cooling tower on the Upper West Side building.
Health officials have said the problem is not the result of any building’s plumbing system, and that anyone who lives in the impacted area can continue to drink tap water, shower, cook, and use their air conditioners.
The NYC Health Department is currently investigating a community cluster of Legionnaires’ disease in the Upper East Side neighborhoods of Carnegie Hill and Yorkville (ZIP codes 10028, 10128, and 10075).
Monday night’s planned public discussion comes days after health officials released a preliminary list of 31 buildings where cooling towers tested positive for the bacteria that causes the disease. Most of those had been disinfected by Friday afternoon. It wasn’t clear how many remained Monday. Register for the town hall here.
Legionnaires’ can’t spread from person to person. It can only be spread through live bacteria. Health officials say symptoms include fever, chills, muscle aches, and cough. People may also have headaches, fatigue, loss of appetite, confusion, or diarrhea. Any vulnerable population with those symptoms should seek care immediately.
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