A third individual has died from Legionnaires' disease in New York City, health officials confirmed on Monday, as an ongoing cluster of cases continues to affect the Upper East Side.

The latest fatality adds to concerns over a localised outbreak of the severe bacterial lung infection, prompting an intensified public health investigation into its source.

Investigation Focuses on Water Systems

New York City's Department of Health and Mental Hygiene is investigating the cluster, which typically arises from contaminated water systems. Legionnaires' disease is contracted by inhaling mist containing the Legionella bacteria, commonly found in sources such as cooling towers, hot tubs, and large plumbing systems.

The disease does not spread from person to person. Symptoms, which can include fever, cough, and shortness of breath, often appear two to ten days after exposure. Elderly individuals, smokers, and those with weakened immune systems are particularly vulnerable to severe illness.

Previous Outbreaks and Public Health Response

New York City has faced previous Legionnaires' outbreaks, notably a significant one in the Bronx in 2015 that led to multiple deaths and prompted stricter city regulations on the maintenance of building water systems, particularly cooling towers.

Health officials are urging residents in the affected Upper East Side area to be vigilant for symptoms. They advise anyone experiencing flu-like symptoms, especially with respiratory issues, to seek medical attention promptly and inform their doctor about potential exposure to the disease.

The investigation is ongoing to pinpoint the precise source of the current contamination and to implement control measures to prevent further cases in the community.