New York City health officials announced a second death Saturday from a legionnaires' disease outbreak that has infected at least 72 people across Manhattan's Upper East Side, though they expressed cautious optimism that the source of transmission has been eliminated.
The health department offered no details about the second victim, following a similar pattern when announcing the first death Friday. Neither announcement included the person's identity, age, or illness timeline.
Dr Alister F Martin, the city's health commissioner, said an intensive campaign targeting air-conditioning systems has produced encouraging results. "We directed every building with an initial positive test result to immediately clean and disinfect its cooling tower, and every one has completed that work," Martin said in a statement.
Tests uncovered either living or dead Legionella bacteria in cooling towers across more than 75 buildings in the neighborhood, including museums, private schools, and residential complexes. The bacteria thrive in warm water and can be dispersed through the fine mist released by these systems.
The outbreak's trajectory suggests the intervention may be working. After confirming roughly eight new cases daily through July 8, the rate of new infections dropped sharply to fewer than one case per day by mid-July.
City officials also reminded cooling tower operators citywide of summer requirements to increase use of biocides that kill the Legionella bacteria. Martin pledged continued inspections of all contaminated towers and enforcement action against any building owners who fail to comply with public health mandates.
Legionnaires' disease, a form of pneumonia caused by Legionella bacteria, kills about one in 10 infected patients according to the CDC. The infection spreads only through inhalation of contaminated water droplets and cannot be transmitted between people. People contract it by breathing in tiny aerosol particles, typically from environmental sources like cooling towers, hot tubs, or showerheads.
The current outbreak marks the second significant legionnaires' disease crisis to strike New York in recent years. In August 2025, seven people died and more than 100 fell ill during an outbreak centered in Harlem.
The disease earned its name following a 1976 outbreak in Philadelphia that primarily sickened attendees at a convention of the American Legion, the veterans' organization.
Author James Rodriguez: "The speed of the city's response and the sharp drop in new cases suggest that aggressive tower testing and remediation can actually work to stop these outbreaks in their tracks."
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