Legionnaires' outbreak hits New York as officials rush to test water towers

July 11, 2026

New York City is responding to a Legionnaires' disease outbreak on the Upper East Side that has sickened 46 people, with 22 requiring hospitalization. The outbreak has been traced to Legionella bacteria growing in contaminated cooling towers on large buildings, which release infectious mist into the air when people breathe it in. City officials have implemented an aggressive testing and disinfection program, identifying bacteria in 31 cooling towers across the neighborhood and requiring immediate cleaning after just one positive test rather than waiting for confirmation.

Who is affected

46 people infected with Legionnaires' disease on the Upper East Side
22 hospitalized patients, some in intensive care units
Residents of the Upper East Side neighborhood (such as Justine Kirby)
Building owners with cooling towers that tested positive for Legionella bacteria
Immunocompromised individuals who face greater risk from the disease

What action is being taken

City officials are testing all cooling towers in the affected area
19 of the 31 contaminated towers have already been disinfected
The city is requiring buildings to fully clean and disinfect cooling towers after one positive test result
The health department is monitoring 160 cooling towers across the region
Some residents are wearing N95 masks and keeping windows closed

Why it matters

This outbreak is significant because Legionnaires' disease is a serious type of pneumonia that can be fatal, particularly for immunocompromised individuals. The Upper East Side contains an exceptionally high concentration of cooling towers—more than three times the number tested during a 2025 Harlem outbreak that killed seven people—creating elevated risk for this densely populated area. Climate change may be exacerbating such outbreaks by creating warmer temperatures that promote bacterial growth, suggesting this public health threat could worsen over time in major cities.

What's next

The remaining contaminated buildings are expected to complete cleaning their towers by Saturday. The city will continue monitoring symptoms in residents and providing medical care and testing for those who become symptomatic.

Read full article from source: BBC