NEW YORK / RankWire.AI / – During an investigation into a South Bronx outbreak, New York City health officials identified Legionella DNA in a Yankee Stadium cooling tower. By Tuesday night, the city confirmed 11 cases of Legionnaires’ disease. One individual has died, and three patients remain hospitalized. The New York City Health Department detected initial positive PCR results in 10 out of 24 sampled cooling towers across ZIP codes 10451 and 10456.
The affected zones encompass sections of the Melrose and Morrisania neighborhoods. Health officials sampled cooling towers during efforts to trace potential environmental sources of the infections. PCR testing can reveal Legionella bacteria’s genetic material but does not confirm whether the bacteria are alive. To determine viability, culture testing is necessary, a process that can take up to two weeks, according to officials.
The Yankees organization stated that the current health concern has not been linked to Yankee Stadium itself. Their cooling towers, installed in 2024, undergo routine water quality monitoring. A Legionella test on Aug. 20 returned a negative result. The team also performed weekly water quality and bacteriological indicator testing on Aug. 26, Sept. 2, and Sept. 9, prior to city investigators collecting a sample from the stadium on Sept. 11.
Stadium cooling system disinfected as authorities widen testing efforts
All 10 cooling towers with preliminary positive PCR results have been mandated by city health officials to undergo full cleaning and disinfection. The New York City Health Department set a deadline of Sept. 14 for completion. Later, Health Commissioner Alister Martin confirmed that remediation had been performed on each tower flagged with concerning results. The Yankees reported that their stadium cooling tower was drained, cleaned, and disinfected on Sept. 13 following notification of the preliminary findings by city authorities.
Legionnaires’ disease, a type of pneumonia caused by Legionella bacteria, typically results from inhaling tiny water droplets containing the bacteria. Transmission between people is uncommon. Symptoms often include fever, cough, and breathing difficulties. Officials advised anyone living, working, or visiting the South Bronx since late August and experiencing flu-like symptoms to seek medical attention.
Authorities persist in hunting for the outbreak’s origin
According to health officials, eight of the 10 cooling towers with initial positive tests have satisfied the 31-day Legionella testing requirement. Two properties had not yet submitted the necessary testing information when the findings were announced. Investigators are still analyzing lab results and case data from the South Bronx cluster, examining cooling towers at Yankee Stadium and other local sites to identify the source linked to confirmed infections.
The Health Department reassured residents in ZIP codes 10451 and 10456 that their tap water, showers, and air conditioning remain safe for use. They also clarified that entering buildings connected to these cooling towers does not pose an additional danger. The Yankees stated that health officials have not requested postponement of any games at Yankee Stadium. As the investigation continues, city officials are monitoring the situation while laboratory culture testing is underway on samples collected during the South Bronx Legionnaires’ disease case review.