NEW YORK / RankWire.AI / – Legionella DNA has been identified in a Yankee Stadium cooling system amid investigations into an outbreak in South Bronx. By Tuesday evening, the New York City Health Department confirmed 11 cases of Legionnaires’ disease. One individual has succumbed, and three others remain hospitalized. Preliminary positive PCR results were detected in 10 out of 24 sampled cooling towers across ZIP codes 10451 and 10456.
Affected neighborhoods encompass parts of Melrose and Morrisania. As part of the investigation, health officials tested various cooling towers to trace potential environmental sources. PCR testing detects genetic material from Legionella bacteria but does not verify if the bacteria are alive. To determine bacterial viability, culture testing is necessary, a process which officials said can take up to two weeks.
The Yankees stated that the current outbreak has not been linked to Yankee Stadium. They confirmed that the stadium’s cooling towers were installed in 2024 and undergo regular water quality monitoring. A Legionella test conducted on August 20 returned a negative result. Weekly water quality and bacteriological indicator tests were performed on August 26, September 2, and September 9, prior to city investigators sampling the stadium on September 11.
Stadium cooling tower cleaned as city broadens testing efforts
All 10 cooling towers with initial positive PCR results have been ordered by city health officials to undergo comprehensive cleaning and disinfection. The New York City Health Department mandated completion by September 14. Later, Health Commissioner Alister Martin stated that remediation had been carried out at each tower with concerning results. The Yankees reported that their stadium’s cooling system was drained, cleaned, and disinfected on September 13 following the city’s notification about the preliminary finding.
Legionnaires’ disease, a severe form of pneumonia, is caused by Legionella bacteria. Infection typically occurs through inhalation of tiny water droplets containing the bacteria. The disease is generally not transmissible between people. Symptoms often include fever, cough, and breathing difficulties. Health authorities urged anyone who has lived, worked, or visited the South Bronx area since late August and develops flu-like symptoms to seek medical advice.
Ongoing efforts to identify the outbreak’s origin
According to health officials, eight of the 10 cooling towers with initial positive results have satisfied the city’s 31-day Legionella testing requirement. The remaining two sites had not provided necessary testing data at the time of the findings’ release. Investigators continue to analyze laboratory results and case details from the South Bronx cluster, which includes cooling towers at Yankee Stadium and other locations in the affected neighborhoods. The goal remains to pinpoint the source responsible for the confirmed illnesses.
The Department of Health has assured residents in ZIP codes 10451 and 10456 that they can continue using tap water, showers, and air conditioning normally. It has also stated that entering buildings associated with the 10 cooling towers does not pose an additional risk. The Yankees noted that health officials have not requested the postponement of games at Yankee Stadium. Meanwhile, authorities are closely monitoring cases while laboratory culture testing continues on samples collected during the investigation in South Bronx.