Second Death Confirmed in South Bronx Legionnaires' Cluster, Case Count at 13-14

Since the New York City Health Department opened its investigation into a new Legionnaires' disease cluster in the South Bronx on September 10, a second person has died. City Health Commissioner Dr. Michelle Morse confirmed the death Thursday evening in a post on social media.

"We mourn the loss of each New Yorker, and our hearts are with their loved ones as they navigate this difficult time," Morse wrote, according to reporting from The Hill, ABC7 New York, and NBC New York.

The cluster is centered in the Melrose and Morrisania sections of the South Bronx, covering ZIP codes 10451 and 10456. Case counts have varied slightly by outlet and by the hour: The Hill and ABC7 New York put confirmed cases at 13, while Insurance Journal and NBC New York reported 14 positive tests as of Wednesday night. Hospitalization figures diverged too, with The Hill reporting two people still hospitalized and Insurance Journal reporting one. Those small discrepancies reflect a fast-moving count, not a factual dispute between outlets.

City health investigators sampled all 24 cooling towers in the affected area. Ten came back positive for Legionella bacteria through initial PCR testing, according to Insurance Journal. That test detects bacterial presence but doesn't confirm a tower is the actual source of exposure. All ten towers have since been cleaned and disinfected, Morse said.

NBC New York, citing city data, listed the positive-testing locations as including Yankee Stadium, Lincoln Hospital, and Boricua College. The Yankees have said none of the current cases has been linked to the stadium, and NBC reported it remained unclear whether the bacteria found there were even alive at the time of sampling. Only live bacteria can cause infection. Culture testing, which confirms whether live Legionella was present, can take up to two weeks, according to Insurance Journal.

Health officials say it's still safe to shower, drink tap water, and run air conditioners in the affected ZIP codes unless told otherwise. Anyone who has lived, worked, or visited the area since late August and develops flu-like symptoms, including fever, chills, muscle aches, cough, or confusion, is being urged to see a doctor immediately, per multiple outlets including CBS News and FOX 5 New York.

The department says it isn't just testing towers. ABC7 New York reported staff have spoken with more than 1,700 community members, handed out over 4,000 pamphlets, and contacted more than 140 organizations to spread word about symptoms and risk factors. A town hall for area residents was held Tuesday, according to CBS News.

A Pattern the City Can't Seem to Break

This is not New York's first Legionnaires' scare this year, and it's not even the South Bronx's first. CBS News noted the neighborhood was the epicenter of the city's deadliest recorded Legionnaires' outbreak, in 2015, which killed 16 people and led directly to the cooling tower regulations now on the books.

Those regulations require monthly testing and annual inspections. Insurance Journal reported the city has completed all 2025 annual inspections and is on schedule for 2026, and that 82% of cooling tower systems citywide are currently in compliance with monthly testing rules.

That leaves roughly one in five systems out of compliance. Given how many people have died from this exact bacteria in this exact city over the past year, the gap merits attention. An Upper East Side outbreak this summer killed 11 people among more than 90 confirmed cases, with 59 cooling towers across 58 buildings testing positive for live Legionella, according to NBC New York. A Harlem outbreak last year killed seven more.

That's three separate clusters, three different neighborhoods, and roughly two dozen deaths in about 14 months, all from bacteria that grows in the same kind of equipment the city has regulated for a decade. Whether that reflects a genuine compliance gap, an aging cooling-tower infrastructure across the five boroughs, or bad luck with a common environmental bacteria is an open question none of the current reporting answers definitively.

What's clear is the mechanism: Legionella breeds in warm, stagnant water, and cooling towers on rooftops are close to ideal conditions for it, per The Hill. The disease doesn't spread person to person. It spreads through inhaled water vapor, and it kills about 10% of people who contract it, according to CDC figures cited by both Insurance Journal and NBC New York.

The city's investigation is ongoing. Culture results on the ten positive towers, including the one at Yankee Stadium, are expected within roughly two weeks of the September 12 sampling date, which would put results in early October. Whether those results tie any of the 13 or 14 confirmed cases to a specific tower, and whether the 18% of cooling towers still out of compliance citywide get any fresh scrutiny from the City Council, remains to be seen.