NEW YORK / RankWire.AI / – An investigation into a South Bronx outbreak revealed that Legionella DNA was found in a Yankee Stadium cooling tower. By Tuesday night, the city confirmed 11 cases of Legionnaires’ disease, with one individual losing their life and three others remaining hospitalized. The New York City Health Department identified preliminary positive PCR results in 10 out of 24 sampled cooling towers across ZIP codes 10451 and 10456.
The outbreak zone encompasses sections of the Melrose and Morrisania neighborhoods. Health officials conducted tests on cooling towers as part of their environmental investigation into potential sources of infection. PCR testing detects genetic fragments of Legionella bacteria but does not confirm if the bacteria are still alive. To determine bacterial viability, culture testing is necessary, a process that can take up to two weeks, according to officials.
The Yankees stated that the current outbreak has not been linked to Yankee Stadium. The team clarified that its cooling towers, installed in 2024, undergo regular water quality inspections. A Legionella test on Aug. 20 yielded a negative result. Additionally, weekly testing for water quality and bacterial indicators was carried out on Aug. 26, Sept. 2, and Sept. 9, prior to city investigators sampling the stadium on Sept. 11.
Stadium cooling tower cleaned amid expanded testing efforts
All 10 cooling towers showing preliminary positive PCR results have been mandated by city health officials to undergo thorough cleaning and disinfection. The New York City Health Department set a deadline of Sept. 14 for completion. Health Commissioner Alister Martin later confirmed that remediation had been performed on each tower with a concerning result. The Yankees reported that their stadium cooling tower was drained, cleaned, and disinfected on Sept. 13 after the city alerted them to the initial findings.
Legionnaires’ disease, a type of pneumonia caused by Legionella bacteria, typically results from inhaling tiny water droplets containing the bacteria. It is generally not spread from person to person. Symptoms can include fever, cough, and difficulty breathing. Health officials advised individuals who have lived, worked, or visited the South Bronx since late August and who develop flu-like symptoms to seek medical attention.
Ongoing efforts to pinpoint the outbreak’s origin
According to health officials, eight of the 10 cooling towers with initial positive PCR results have met the city’s 31-day Legionella testing requirements. Two other locations had not provided the necessary testing documentation when the findings were announced. Investigators continue to analyze laboratory results and case data related to the South Bronx cluster. Their investigation includes cooling towers at Yankee Stadium and other sites within the affected neighborhoods, as they seek to identify the source linked to the confirmed cases.
The Health Department reassured residents in ZIP codes 10451 and 10456 that they can safely use tap water, showers, and air conditioning systems as usual. Officials also stated that entering buildings connected to the 10 cooling towers poses no additional risk. The Yankees confirmed that health authorities have not requested any postponement of games at Yankee Stadium. City officials remain vigilant as laboratory culture tests continue on samples collected during the South Bronx Legionnaires’ disease investigation.