A Legionnaires' disease outbreak on Manhattan's Upper East Side has sickened at least 28 people, prompting New York City health officials to order 19 buildings to drain, clean, and disinfect their cooling towers. Health Commissioner Dr. Alister Martin attributed the outbreak partly to climate change, stating, 'This is now a subtropical climate. It is absolutely true that climate change is worsening our exposure and increasing the propensity for Legionnaires' disease clusters like we’re seeing today.'
Outbreak Details and Response
The outbreak is concentrated in three affluent zip codes on the Upper East Side, a neighborhood between Central Park and the East River. The New York City Department of Health has sampled water from nearly 160 building cooling towers to test for the Legionella pneumophila bacterium. Dr. Martin signed orders for at least 19 'buildings of interest' to undergo remediation, though extensive testing is still needed to identify the exact source.
Legionnaires' disease is a severe form of pneumonia caused by inhaling vapors or mists containing Legionella bacteria, which thrive in warm water environments. While the disease affects fewer than three people per 100,000, it has a mortality rate of up to 10% among diagnosed cases. Symptoms include cough, fever, headaches, muscle aches, and shortness of breath.
Historical and Disproportionate Impact
First identified in 1976 after an outbreak among American Legion veterans in Philadelphia, Legionnaires' disease has since caused rising global outbreaks. Urban conditions such as aging infrastructure, poor maintenance, and populations with chronic conditions contribute to its spread. Past outbreaks in New York have disproportionately affected low-income communities and Black Americans, a pattern that has frustrated local leaders. Marquis Harrison, chair of a Manhattan community board in Harlem, noted, 'I started to believe that Legionella only knew Black and brown neighborhoods. We only saw it in the South Bronx and in Harlem, and only communities of color.'
George Yates, a 54-year-old Harlem resident, was diagnosed with Legionnaires' in a 2018 outbreak in Washington Heights. He believes he contracted the bacteria while driving through the area for a ride-share company. 'You’re walking down the street minding your own business, breathing in the air, and the air may be contaminated from a cooling tower you can’t even see,' he said. Yates was hospitalized for five days but recovered.
Challenges in Outbreak Investigation
Health officials face challenges in pinpointing the outbreak's source. Epidemiologists must culture water samples to confirm live Legionella colonies, then sequence their genomes and compare them to sputum samples from patients. However, doctors often use urine tests for Legionnaires', meaning some patients may not have sputum samples available. The health department expects the investigation to take another month, and in many smaller outbreaks, the source is never found.
Dr. Benjamin Wyler, an emergency medicine physician at Mount Sinai Health System, advised residents not to live in fear but to seek care if they develop febrile illness, cough, or gastrointestinal issues. 'But if you’re developing symptoms like a febrile illness and cough, or malaise, gastrointestinal issues, you should maybe have a lower threshold to seek care,' he said.
Climate Change and Future Risks
Even after the investigation, climate change will likely continue to create favorable conditions for Legionella. Cases have been linked to hot tubs, water jet cutters, floor scrubbers, fountains, and even non-genuine windshield cleaner in vehicles. Dr. René Najera, director of public health at the College of Physicians of Philadelphia, remarked, 'The bacteria don’t care. If they see a warm spot with water they’re going to thrive and multiply.' He added, 'I don’t know if we’re past the point of no return on climate change, but certainly, it’s not helping.'
