NEW YORK / RankWire.AI / – During an investigation into an outbreak in South Bronx, 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, with one fatality and three individuals hospitalized. The New York City Health Department found preliminary positive PCR results in 10 of 24 cooling towers sampled across ZIP codes 10451 and 10456.
The zone affected covers parts of the Melrose and Morrisania neighborhoods. Officials collected samples from cooling towers while investigating potential environmental sources of the infections. PCR testing detects 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 authorities.
The Yankees stated that their current outbreak is not linked to Yankee Stadium. They confirmed that their cooling towers, installed in 2024, undergo routine water quality inspections. A Legionella test on Aug. 20 returned a negative result. Additionally, the team performed weekly water and bacteriological testing on Aug. 26, Sept. 2, and Sept. 9, prior to the city’s sample collection at the stadium on Sept. 11.
Stadium cooling tower disinfected as testing expands
All 10 cooling towers with preliminary positive PCR outcomes have been ordered by city health officials to undergo thorough cleaning and disinfection. The New York City Health Department mandated completion of this work by Sept. 14. Later, Health Commissioner Alister Martin confirmed that remediation was carried out on each tower with concerning results. The Yankees reported that their stadium cooling tower was drained, cleaned, and disinfected on Sept. 13 after the city informed them of the preliminary findings.
Legionnaires’ disease, a type of pneumonia caused by Legionella bacteria, typically results from inhaling tiny water droplets containing the bacteria. The disease is generally not transmitted from person to person. 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 develop.
Authorities persist in identifying the outbreak’s origin
According to health officials, eight of the 10 cooling towers with preliminary positive PCR results have met the city’s 31-day Legionella testing requirement. The remaining two sites have not yet provided the necessary testing data. Investigators continue reviewing lab results and case details from the South Bronx cluster, focusing on cooling towers at Yankee Stadium and other nearby properties to trace the source linked with the confirmed illnesses.
The Health Department assured residents in ZIP codes 10451 and 10456 that normal use of tap water, showers, and air conditioning can continue. They also stated that entering buildings associated with the 10 cooling towers does not pose an additional risk. The Yankees confirmed that health authorities have not requested a postponement of games at Yankee Stadium. Meanwhile, city officials are closely monitoring ongoing cases as laboratory culture testing continues on samples gathered during the South Bronx Legionnaires’ disease investigation.