Fifth Death in NYC Legionnaires' Outbreak

The death toll from a Legionnaires’ disease outbreak on Manhattan’s Upper East Side has risen to five, with the total number of infected individuals reaching 82 as of Tuesday. According to multiple reports, health officials reported no new cases or symptoms in over six days, indicating that the primary exposure source may have been eliminated.

The first death was reported last week on Friday, followed by a second death on Saturday. The third and fourth deaths were announced over the weekend, with Dr. Alister F. Martin, New York City Health Commissioner, expressing condolences for the families affected. According to CBS News, property owners have been ordered to drain and disinfect cooling towers where Legionella bacteria were detected.

The outbreak is linked to cooling towers that are part of air conditioning systems for large buildings. Confirmatory culture test results came back positive for live Legionella bacteria in 34 cooling towers across 33 buildings on the Upper East Side, as reported by The Guardian. Nine cooling towers have negative culture test results, while results for the remaining 140 cooling tower systems are expected over the coming week.

As of Sunday, eight patients remain hospitalized, 56 have been discharged from the hospital, and 12 did not need to be hospitalized. According to The Guardian, Legionnaires’ disease kills about 10% of patients according to the US Centers for Disease Control and Prevention (CDC). Health officials emphasize that the disease does not spread person-to-person and is treatable with antibiotics if caught early.

The current outbreak has prompted aggressive testing and remediation efforts across nearly 200 cooling towers, with 76 testing positive for Legionella bacteria. All affected buildings have completed required cleaning and disinfection procedures, according to CBS News. The outbreak has drawn attention due to its severity and the rapid response from health authorities.

Inspections have revealed that some of the neighborhood’s fancy apartment buildings, private schools, and renowned museums had traces of Legionella bacteria in their air-cooling equipment despite new regulations that increased testing requirements this spring. The Guggenheim Museum stated that an outside company tests and treats its cooling tower every month.

Jory Lange, a Texas attorney representing over 50 people affected by last year’s outbreak in Harlem, expressed frustration, stating there is no excuse for such outbreaks to keep happening given New York's strong regulations. Dr. Martin emphasized the department’s quick action after the first two confirmed cases, which he believes saved lives.

Following the Harlem outbreak, city leaders authorized additional hires of Legionella-focused water ecologists and supervisors, bringing the total intended staff to 56. Currently, there are 35 staff members with another 14 in training. The agency has conducted nearly 1,600 cooling tower inspections in the first six months of the year, a 35% increase compared to the same period in 2025.