NEW YORK / RankWire.AI / – Health officials in New York City identified Legionella DNA in a Yankee Stadium cooling tower amid an investigation into an outbreak in the South Bronx. As of Tuesday night, the city confirmed 11 cases of Legionnaires’ disease, with one death and three patients still hospitalized. The New York City Health Department reported preliminary positive PCR results from 10 out of 24 sampled cooling towers across ZIP codes 10451 and 10456.
The affected zones include sections of Melrose and Morrisania. In their efforts to trace environmental sources of infection, health officials tested multiple cooling towers. PCR testing detects Legionella bacteria’s genetic material but does not confirm whether the bacteria are alive. Culturing tests, which can confirm viable bacteria, may take up to two weeks, according to authorities.
The Yankees stated there is no link between the current outbreak and Yankee Stadium. They explained their cooling towers, installed in 2024, undergo regular water quality inspections. A Legionella test on Aug. 20 was negative, and weekly water and bacteriological monitoring took place on Aug. 26, Sept. 2, and Sept. 9, prior to city officials collecting a sample from the stadium on Sept. 11.
Stadium cooling tower disinfected as city broadens testing efforts
All 10 cooling towers with initial positive PCR results have been mandated to undergo full cleaning and disinfection, with the New York City Health Department requiring this work to be completed by Sept. 14. City officials later confirmed that remediation was carried out on each tower with concerning results. The Yankees reported their stadium cooling tower was drained, cleaned, and disinfected on Sept. 13, following notification from authorities about the preliminary findings.
Legionnaires’ disease, a type of pneumonia caused by Legionella bacteria, typically infects individuals through inhalation of tiny water droplets containing the bacteria. Transmission between people is rare. Symptoms include fever, cough, and breathing difficulties. Officials urged anyone living, working, or visiting the South Bronx since late August to seek medical care if flu-like symptoms appear.
Continued efforts to trace the outbreak’s origin
According to health officials, eight of the 10 cooling towers with preliminary positive results have met the city’s 31-day Legionella testing requirement. Two sites have yet to submit the necessary testing data. Investigators are reviewing laboratory findings and case details from the South Bronx cluster. The investigation includes cooling towers at Yankee Stadium and other properties within the impacted neighborhoods, as officials work to identify the source linked to the confirmed cases.
The Health Department assured residents in ZIP codes 10451 and 10456 that they can continue using tap water, showers, and air conditioning normally. They also clarified that entering buildings associated with the cooling towers poses no additional health risk. The Yankees confirmed that authorities have not requested a postponement of games at Yankee Stadium. Monitoring remains ongoing as laboratory culture testing continues on samples collected during the investigation in the South Bronx.