New York City health officials have confirmed that the number of Legionnaires’ disease cases linked to an outbreak on Manhattan’s Upper East Side has increased to 14, prompting an expansion of the area under active monitoring.

The city’s Department of Health has now added the 10075 ZIP code to the affected zone as investigators continue efforts to identify the source of the bacteria responsible for the infections. The outbreak has prompted increased testing and public health outreach across the neighborhood.

Officials are encouraging anyone who has lived, worked, or spent time in the area since late June to remain alert for symptoms and seek medical care if they begin feeling unwell.

Cooling towers under investigation

City health authorities are focusing their investigation on cooling towers, which have been linked to previous outbreaks of Legionnaires’ disease. Water samples are currently being collected and tested from cooling systems across the affected area to determine whether they contain Legionella bacteria.

If contamination is detected, building owners will be required to immediately disinfect and remediate their cooling tower systems to prevent further spread.

Mayor Zohran Mamdani sought to reassure residents that the outbreak is not connected to building plumbing systems or residential air conditioning units. He emphasized that tap water remains safe for drinking, cooking, and bathing, and residents can continue using air conditioners and public cooling centres without concern.

Residents urged to watch for symptoms

Health Commissioner Dr. Alister Martin has advised anyone who may have been exposed in the affected area to monitor their health closely. Symptoms of Legionnaires’ disease can resemble the flu and may include fever, persistent cough, shortness of breath, muscle aches, and general fatigue.

Medical providers across the city have received a health alert to help identify and treat potential cases quickly, while community outreach campaigns are being launched to raise awareness among residents and businesses.

Early diagnosis is considered critical, as the illness responds well to antibiotic treatment when detected promptly.

Understanding Legionnaires’ disease

Legionnaires’ disease is a severe form of pneumonia caused by Legionella bacteria, which thrive in warm water environments such as cooling towers, hot tubs, and large water systems. Infection occurs when people inhale tiny droplets of contaminated water released into the air.

Health officials stressed that the disease does not spread from person to person, helping to reduce concerns about direct transmission within the community.

Investigators will continue testing water systems until the source of the outbreak is identified and addressed. In the meantime, city officials maintain that everyday activities including using tap water, air conditioning, and public facilities remain safe, while encouraging residents to seek medical attention promptly if respiratory symptoms develop.

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