Health officials are racing to contain a Legionnaires’ disease cluster on Manhattan’s Upper East Side after two cases were confirmed and more are expected in the coming days. The alert covers ZIP codes 10028 and 10128, and anyone who lives, works or has recently visited those areas and develops fever, cough or other flu-like symptoms is urged to contact a health care provider right away.
There is a legionnaires cluster on the Upper East Side. 2 cases confirmed so far. But this is very early and more expected. Zip codes impacted: 10028 & 10128. If you live, work or have recently visited the two zip codes and have flu-like symptoms contact a health care provider as soon as possible.
— Mark D. Levine (@marklevinenyc) Jul 2, 2026
Early Alert From Local Officials
In an early heads-up to residents, Mark D. Levine posted that two Legionnaires’ cases have been confirmed in the affected ZIP codes and warned that more illnesses are expected. He urged anyone with flu-like symptoms who lives, works or recently visited 10028 or 10128 to seek medical attention immediately rather than waiting it out at home.
City Health Department Moves Quickly
The New York City Health Department says it is investigating a community cluster in Carnegie Hill and Yorkville, which fall within ZIP codes 10028 and 10128, and has not linked the cluster to any building plumbing. According to the NYC Health Department, residents can continue to drink tap water and use air conditioners while the investigation continues.
The agency advised anyone in the affected area who has experienced symptoms since late June to contact a health care provider or call 311 for help getting evaluated and, if needed, tested and treated.
Recent Local Cases and Citywide Context
Local reporting shows the Health Department evaluated Upper East Side buildings earlier this year after two residents fell ill, ordering water testing and disinfection at affected sites. As reported by Upper East Site, those investigations led to building-level remediation in some cases.
Who Is Most at Risk and What to Watch For
Legionnaires’ disease is a severe form of pneumonia caused by Legionella bacteria. Common symptoms include cough, fever, muscle aches and shortness of breath. Certain people, particularly adults age 50 and older, current or former smokers, and people with chronic lung disease or weakened immune systems, are at higher risk of getting sick, according to the CDC.
What Residents and Building Managers Should Do
Anyone in the affected ZIP codes who develops fever, cough or difficulty breathing should tell their clinician about possible exposure to Legionella and ask about testing, including the urine antigen test, along with early antibiotic treatment if appropriate.
Building owners and managers are required to cooperate with Health Department investigations and comply with city rules on cooling tower registration, testing and remediation. Local officials have also scheduled community briefings to answer residents’ questions, according to Councilmember Ben Kallos and official city guidance.
This is a developing situation, and the Health Department says it will release more information as its investigation proceeds. Residents are advised to rely on official DOH notices for the latest guidance and to contact a medical provider promptly if they develop symptoms.
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