Upper East Side Outbreak Under Investigation
New York City health officials are responding to a community cluster of Legionnaires’ disease cases on the Upper East Side, where bacteria linked to the illness have been detected in cooling towers. The city’s Department of Health and Mental Hygiene said Tuesday that towers on 76 buildings in the area tested positive for Legionella bacteria.
Sixty Cases Confirmed This Month
Pneumonia caused by Legionella has been confirmed in 60 people this month. No deaths have been reported. Fifteen people remain hospitalized, while 34 have already been discharged from the hospital.
Illness Can Be Serious for Some Patients
Legionnaires’ disease can become severe, especially for people with higher health risks. According to the U.S. Centers for Disease Control and Prevention, about 1 in 10 people who develop the illness die from it.
Cooling Towers Identified as Likely Source
Officials believe the cluster is tied to bacteria in cooling towers, which are commonly used in large buildings for refrigeration and cooling. These systems release heat by moving outside air through warm water, creating vapor that can spread bacteria if contamination is present.
How People Can Be Exposed
People can become sick when they breathe in contaminated mist or vapor from systems that contain Legionella. Warm and wet environments, including cooling towers, hot tubs, spas and some plumbing systems, are known to be more vulnerable to this type of bacterial growth.
Cases Concentrated in Three ZIP Codes
New York records hundreds of Legionnaires’ disease cases each year, but officials have identified a recent spike in three Upper East Side ZIP codes: 10128, 10028 and 10075. Anyone who spent time in those areas over the past couple of weeks is being urged to monitor for symptoms.
Symptoms Residents Should Watch For
Possible symptoms include fever, chills, fatigue, headaches, loss of appetite, confusion and diarrhea. Because symptoms can appear several days after exposure, officials say additional cases may still be identified.
Who Faces Higher Risk
Most people exposed to Legionella bacteria do not become ill. Those at higher risk include adults over 50, people who smoke or vape, people with weakened immune systems and those with underlying conditions such as diabetes or lung disease.
No Vaccine or Preventive Medicine
There is no vaccine or medicine to prevent Legionnaires’ disease. The New York health department also said masks do not appear to provide protection against this type of exposure. Treatment typically involves antibiotics and, in more serious cases, oxygen therapy or intensive care.
Testing Conducted Across 183 Cooling Towers
The health department tested 183 cooling towers considered potential sources in the affected ZIP codes. Building owners with positive results were ordered to drain, clean and disinfect the contaminated towers.
Most Required Cleaning Has Been Completed
Dr. Alistair Martin, commissioner of the New York City Department of Health and Mental Hygiene, said Tuesday that owners of 57 buildings had confirmed completion of the required remediation. The remaining 19 buildings must complete the process by Thursday.
Officials Say Wide Testing Was Expected
Martin said the number of affected buildings was significant but not unexpected, given the concentration of cooling towers on the Upper East Side. He said the initial screening effort was intentionally broad because Legionella is common in built environments.
Not Linked to Drinking Water or Air Conditioners
Public health officials emphasized that this cluster is not connected to drinking water, showers or individual air-conditioning units. They also noted that Legionnaires’ disease does not spread from person to person.
Early Antibiotic Treatment Is Important
Health officials said the illness can be managed effectively when patients receive antibiotics early. Anyone who recently spent time in the affected area and develops symptoms is encouraged to seek medical care promptly.
More Cases May Still Be Reported
The rate of new cases appears to be slowing, but officials cautioned that the incubation period can range from two to 14 days. That means some people who were exposed may not yet know they are sick.
Further Testing Will Take Weeks
The city plans additional testing to determine more precisely where the outbreak began and to distinguish between live and dead bacteria. The initial tests cannot make that distinction, and confirmatory bacterial culture results may take several weeks.
City Says It Acted Before Final Confirmation
Martin said officials did not wait for final culture testing before ordering remediation. He said the city took an aggressive approach because waiting weeks would have delayed action against a potential source of illness.
