NEW YORK / RankWire.AI / – Officials from New York City’s health department identified Legionella DNA within a Yankee Stadium cooling tower as part of their probe into a recent outbreak in the South Bronx area. By Tuesday evening, the city confirmed 11 cases of Legionnaires’ disease linked to the outbreak. One individual has succumbed to the illness, and three others remain hospitalized. The New York City Health Department reported preliminary positive PCR results from 10 out of 24 cooling towers sampled across ZIP codes 10451 and 10456.
This affected zone covers sections of the Melrose and Morrisania neighborhoods. To identify environmental sources that may have contributed to the infections, health officials tested various cooling towers, utilizing PCR testing to detect Legionella bacteria’s genetic material. While PCR can reveal the presence of bacterial DNA, it does not confirm whether the bacteria are still alive. To establish if viable bacteria are present, culture testing is required, a process that officials say can take up to two weeks to complete.
The Yankees organization clarified that their stadium’s cooling towers have not been linked to the current outbreak. They stated that the towers were installed in 2024 and are subject to routine water quality checks. A Legionella test conducted on August 20 yielded a negative result. Additionally, the team performed weekly water quality and bacteriological indicator assessments on August 26, September 2, and September 9, prior to city investigators collecting a sample from the stadium on September 11.
Stadium cooling tower undergoes cleaning as city broadens testing efforts
In response to the preliminary findings, city health officials mandated the thorough cleaning and disinfection of all 10 cooling towers that tested positive via PCR. The New York City Health Department set a deadline of September 14 for completing this work. Later, Health Commissioner Alister Martin confirmed that remediation had been carried out on each tower with concerning results. The Yankees reported that their stadium cooling tower was drained, cleaned, and disinfected on September 13, after the city informed them of the initial detection.
Legionnaires’ disease manifests as a severe pneumonia caused by Legionella bacteria. It typically develops when individuals inhale tiny water droplets containing the bacteria. Person-to-person transmission is uncommon. Symptoms often include fever, cough, and difficulty breathing. Officials advised anyone who has lived, worked, or visited the South Bronx area since late August to seek medical attention if flu-like symptoms appear.
Ongoing efforts to identify the outbreak’s origin continue
According to health officials, eight of the 10 cooling towers with initial positive PCR results have completed the city’s 31-day Legionella testing requirement. The remaining two properties have yet to provide the necessary testing data. Investigators are actively analyzing laboratory results and case details from the South Bronx cluster. Their investigation includes examining cooling towers at Yankee Stadium and other nearby properties, aiming to pinpoint the source connected to the confirmed cases.
The Health Department reassured residents in ZIP codes 10451 and 10456 that they can continue to use tap water, showers, and air conditioning systems as usual. They also emphasized that entering buildings associated with the 10 cooling towers does not pose an additional health risk. The Yankees stated that health officials have not requested the postponement of any games at Yankee Stadium. Meanwhile, city officials maintain ongoing surveillance of cases while awaiting the results of laboratory culture testing on samples collected during the South Bronx Legionnaires’ disease investigation.