New York City health officials are investigating a cluster of Legionnaires’ disease cases affecting two neighborhoods on the Upper East Side. As of July 6, the outbreak has resulted in 23 confirmed cases, with 17 individuals hospitalized. No deaths have been reported.
The likely source of the bacteria, identified as Legionella, is believed to be one or more cooling towers in the affected areas. These systems, commonly found atop buildings, are used for temperature regulation in refrigeration and other building systems. The city's health department is in the process of testing all cooling towers within the Carnegie Hill and Yorkville neighborhoods, identified by ZIP codes 10028, 10128, and 10075.
Legionnaires' disease is a severe form of pneumonia caused by Legionella bacteria, which thrive in warm water and can spread through building water systems. Common sources include showerheads, hot tubs, and cooling towers. Transmission typically occurs when people inhale contaminated water droplets.
Symptoms of Legionnaires' disease usually appear between two days and two weeks after exposure. They can include cough, fever, headaches, muscle aches, and shortness of breath. Individuals at higher risk include those aged 50 and older, current or former smokers, people with chronic lung conditions, and those with weakened immune systems.
Health officials have stated that residents can continue to drink tap water, bathe, shower, cook, and use air conditioners, as the bacteria is not spread through plumbing issues or person-to-person contact. People experiencing flu-like symptoms are advised to contact a healthcare provider promptly.
If left untreated, Legionnaires' disease can lead to serious complications such as respiratory failure, shock, and organ failure. The Centers for Disease Control and Prevention notes that approximately one in 10 people who contract the disease may die from complications. Prompt diagnosis and antibiotic treatment are crucial for recovery.
Building managers and water system operators can mitigate the risk by regularly cleaning and disinfecting cooling towers, maintaining adequate chlorine levels in spa pools, and flushing unused taps. Homeowners can take steps such as draining garden hoses, following manufacturer instructions for water filter maintenance, regularly checking chlorine levels in pools and hot tubs, and flushing hot water heaters twice a year.