New York City Vowed Reform After Harlem’s Legionnaires’ Deaths. A New Outbreak Is Exposing the Gaps

After a deadly Legionnaires’ disease outbreak on the Upper East Side, WNYC health reporter Caroline Lewis and investigative data reporter Joe Hong explain how the illness spreads, what went wrong during the 2025 Harlem outbreak and why major gaps in cooling tower testing and inspections remain.

Photo: Spencer Platt/Getty Images

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