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NYC DOH Closes Case on Latest Legionnaires’ Disease Cluster in The Bronx

HIGHBRIDGE PARK
Photo courtesy of etzelism via Flickr

The City’s health department announced on June 17 that the investigation into the Highbridge community cluster of Legionnaires’ disease has been closed. “No new cases of Legionnaires’ disease have been identified in residents of the area with symptom onset in the last four weeks,” health officials said. There were 30 cases of Legionnaires’ disease associated with the cluster. Twenty-eight people were hospitalized, 24 have been discharged, and two New Yorkers died, as reported.

 

Remediation was ordered in early May by the department after four cooling towers in the Highbridge and Melrose sections of the borough tested positive for the presence of Legionella pneumophila, a type of bacteria that causes Legionnaires’ disease.

 

According to NYC Department of Buildings (DOB), a cooling tower is a heat exchanger that contains water and is used to remove excess heat by some buildings as part of their air conditioning, ventilation, and/or heating systems. Cooling towers are used to cool water by putting air and water into direct contact to extract waste heat into the atmosphere. When the water and air meet, a small amount of water is evaporated, creating a cooling action. The cooled water is then pumped back to the condenser or process equipment where it absorbs heat.

 

As reported, Legionnaires’ disease is a type of pneumonia caused by a bacteria that grows in warm water. Symptoms resemble other types of pneumonia and can include fever, chills, muscle aches, and cough. Most cases of Legionnaires’ disease can be traced to contamination of artificial water systems where conditions are favorable for Legionella growth, such as cooling towers.

 

People get sick by breathing in water vapor containing Legionella bacteria — it is not transmitted from person to person. Legionnaires’ disease is not caused by drinking from water that has Legionella bacteria. Individuals at higher risk include those ages 50 and above, cigarette smokers, and people with chronic lung disease or compromised immune systems.

 

The health department informed Norwood News on June 8 that it had ordered the four Highbridge area cooling towers that had tested positive for Legionnaires’ disease to be treated with chemicals that kill the bacteria. “Further testing results confirmed Legionella pneumophila in three of these towers and all three were fully cleaned and disinfected,” a City official said.

 

The official added at the time, “These test results do not show whether any of these towers caused cases of Legionnaires’ disease (in the affected patients). The department is sometimes able to link a cooling tower with cases (making a genetic match). If we make this link, we will share those findings.”

 

The health official added at the time, “Those who live or work in the Highbridge area should continue to monitor for symptoms of Legionnaires’ disease (including fever, chills, muscle aches, cough, headaches, fatigue, loss of appetite, confusion or diarrhea) and contact their health care provider at the first sign of feeling unwell. People in the neighborhood are at risk regardless of whether they live or work in a building with one of the cooling towers that tested positive for Legionella pneumophila.”

 

We asked DOH if the agency could confirm the precise location of the impacted towers which were being examined as part of the investigation. They confirmed that these were at:

  • 881 Gerard Avenue
  • 1325 Jerome Avenue
  • 1181 Nelson Avenue
  • 1020 Grand Concourse

 

After what was described by City health officials as an extensive epidemiologic investigation, sampling of area cooling towers, and molecular analysis of Legionella bacteria from human and cooling tower specimens, the health department’s public health laboratory and epidemiologists matched the Legionella strain found in the cooling tower located at 1325 Jerome Avenue, ZIP code 10452, with the strain found in two patients from the Highbridge cluster.

 

“The health department sampled that cooling tower on the day the investigation began, on May 20,” health officials said. “The building owner was ordered to immediately disinfect on May 23 and perform additional remediation on June 3. The building has complied and is working with the health department on their long-term management program.”

 

Health Commissioner Dr. Ashwin Vasan said, “Thank you to the dozens of elected officials and community leaders who worked with the department to inform residents in the area about proper precautions. The department’s investigation was able to identify one cooling tower that had a genetic match with patient specimens, and the cooling tower was ordered to take additional cleaning and disinfection measures.”

 

As reported, there was an outbreak of Legionnaires’ disease in October 2019 in Jerome Park’s Tracey Towers, when the City’s health department told residents of 20 West Mosholu Parkway South that the water supply system in their building had tested positive for the Legionella bacteria. Four cases of Legionnaires’ disease were identified among residents. The impacted residents were later confirmed as having been discharged from the hospital.

 

 

Welcome to the Norwood News, a bi-weekly community newspaper that primarily serves the northwest Bronx communities of Norwood, Bedford Park, Fordham and University Heights. Through our Breaking Bronx blog, we focus on news and information for those neighborhoods, but aim to cover as much Bronx-related news as possible. Founded in 1988 by Mosholu Preservation Corporation, a not-for-profit affiliate of Montefiore Medical Center, the Norwood News began as a monthly and grew to a bi-weekly in 1994. In September 2003 the paper expanded to cover University Heights and now covers all the neighborhoods of Community District 7. The Norwood News exists to foster communication among citizens and organizations and to be a tool for neighborhood development efforts. The Norwood News runs the Bronx Youth Journalism Heard, a journalism training program for Bronx high school students. As you navigate this website, please let us know if you discover any glitches or if you have any suggestions. We’d love to hear from you. You can send e-mails to norwoodnews@norwoodnews.org or call us anytime (718) 324-4998.

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