Legionnaires’ Disease Outbreak in New York City

In New York City, the Legionnaires’ disease outbreak has now affected 59 individuals, with the source initially traced to the Upper East Side. However, the bacteria has also been detected in a luxury building on the Upper West Side.

The health department reported that out of approximately 50 infected people, a significant majority—48—required hospitalization due to severe pneumonia linked to this potentially lethal disease.

The number of confirmed cases has increased from 46 as of Saturday, when 22 individuals had been hospitalized. Fortunately, there have been no reported fatalities in this recent outbreak, which has even reached the well-known Guggenheim Museum. Officials anticipate more positive tests in the following days.

All confirmed cases have emerged from the Upper East Side.

Interestingly, the hot water system in the Ardsley building at 320 Central Park West, where one-bedroom apartments go for nearly $1 million, also tested positive for the Legionella bacteria. This building has since undergone disinfection of its systems.

During a separate news conference, Mayor Zoran Mamdani reassured that the positive test at Ardsley should not raise concerns. “There are no cooling towers for this building on the Upper West Side,” he noted, indicating that such towers are typically associated with outbreaks.

The city is investigating this incident as a “community cluster,” particularly affecting the Carnegie Hill and Yorkville areas of the Upper East Side. The outbreak was first reported on July 2nd.

Legionnaires’ disease is often contracted when multiple individuals in a specific area fall ill, with common infection sources being cooling towers, hot tubs, and spray fountains. Inspections of the roughly 183 cooling towers in the impacted areas were completed last week, revealing bacteria in 31 buildings, including the Guggenheim.

Health officials confirmed that all 31 affected buildings have had their cooling towers cleaned and disinfected. Furthermore, more than half of the cooling towers inspected had issues, such as not performing required monitoring and cleaning, as well as failing to submit necessary Legionella test results.

The city has advised anyone who has lived, worked, or visited the affected areas since late June to seek medical attention promptly if they experience flu-like symptoms.