Sixth Death Confirmed in Harlem Legionnaires’ Outbreak; 112 Cases Reported

NEW YORK (August 25, 2025) - New York City health officials today confirmed the sixth fatality linked to a persistent Legionnaires’ disease outbreak in Central Harlem, where 112 residents have now been diagnosed since late July. Seven patients remain hospitalized, according to the latest update from the New York City Department of Health.

All 12 cooling towers across 10 buildings-among them a city-run hospital and a sexual health clinic-have tested positive for Legionella bacteria and have since undergone thorough cleaning and treatment. Acting Health Commissioner Dr. Michelle Morse reiterated that early diagnosis and antibiotic treatment are critical, especially for high-risk individuals such as adults over 50, smokers, and those with chronic lung conditions.

“Anyone living or working in Central Harlem who develops flu-like symptoms-cough, fever, muscle aches, chills, or shortness of breath-should seek medical attention immediately,” Dr. Morse advised.

Legionnaires’ disease is a severe form of pneumonia caused by inhaling water droplets contaminated with Legionella bacteria. While not transmissible person-to-person, the disease carries a mortality rate of approximately 10% if untreated. City officials continue to urge residents and visitors in the affected area to remain vigilant and to follow maintenance guidelines for water systems and cooling towers to prevent further spread.

Key Facts

• Outbreak start: Late July 2025 (cluster first identified July 25)
• Total cases: 112 (as of August 25)
• Deaths: 6 confirmed
• Hospitalizations: 7 currently
• Source: Legionella contamination in 12 cooling towers across Central Harlem
• Action taken: All implicated towers have been remediated and tested negative following treatment

Residents with symptoms or concerns can call the NYC Health Department’s hotline at 311 for guidance and screening.