Two people have now died in the Legionnaires' disease outbreak centered on Manhattan's Upper East Side, and the case count has climbed to 72 as of Saturday evening, July 19, 2026, with 9 people still hospitalized, according to the New York City Department of Health and Mental Hygiene. Legionella bacteria, which causes the severe form of pneumonia responsible for these deaths, has been detected in cooling towers across 76 buildings in the neighborhood, including the Solomon R. Guggenheim Museum, the Metropolitan Museum of Art, famed private schools, and luxury apartment buildings.
No single building has been confirmed as the source of the outbreak. All affected buildings have been ordered to clean, drain, and disinfect their cooling towers. City officials said data indicate that the source of exposure has likely been eliminated, but the investigation is ongoing.
Why This Matters
Legionnaires' disease is not a minor illness. It is a severe form of pneumonia that kills approximately 1 in 10 people who develop it, according to the CDC. The man who became the second victim had been living independently before he was rushed to Lenox Hill Hospital on July 2 with a 104-degree fever, according to his attorney Ronald Katter, who spoke to Patch. He was in his 80s, had no known underlying conditions, walked without assistance, and died on life support after physicians were unable to wean him off a ventilator or dialysis. The disease moves fast, and it moves hardest against the people who appear healthiest.
The involvement of the Guggenheim Museum and the Metropolitan Museum of Art means that millions of visitors who came to the Upper East Side since the outbreak began tracking on July 2 may have had potential exposure to contaminated water vapor without knowing it. The two museums alone typically draw tens of thousands of visitors per week.
"We are heartbroken to learn that another New Yorker has lost their life to Legionnaires' disease on the Upper East Side. Our deepest condolences are with their loved ones as they grieve," NYC Health Commissioner Dr. Alister F. Martin said in a statement, reported by PBS News.
What We Know So Far
The outbreak was first detected on July 2, 2026, when two people were diagnosed with Legionnaires' disease in the area. As of Saturday evening, July 19, the case count had climbed to 72, up from 67 earlier in the week, with 50 additional people having been discharged from hospitals after earlier hospitalization, according to NBC New York.
The investigation is focused on three ZIP codes: 10028, 10128, and 10075, encompassing parts of Carnegie Hill and Yorkville on Manhattan's Upper East Side. The NYC Department of Health tested cooling towers on more than 75 buildings in the area and found Legionella bacteria, either living or dead, in 76 of them, including one on the Upper West Side. All of these buildings were ordered to clean, drain, and disinfect their cooling towers.
Among the buildings with positive tests that have been named in news reporting: the Solomon R. Guggenheim Museum and the Metropolitan Museum of Art. Private schools and high-end residential buildings in Carnegie Hill have also been identified as positive-testing sites, according to reporting by NBC New York and Fox News.
Importantly, the city has stated that 76 buildings tested positive, but investigators have not yet pinpointed which of them contributed to the outbreak. It is also possible that more than one cooling tower is responsible. The required remediation has been completed at all positively tested buildings.
Where the Risk Is Highest
The exposure zone is geographically defined: the Carnegie Hill and Yorkville sections of the Upper East Side between approximately East 74th Street and East 98th Street, particularly around Park Avenue, Madison Avenue, and Fifth Avenue. Anyone who spent time in this area after June 28, 2026, the likely start of the exposure period, and who develops symptoms in the days ahead should seek medical evaluation and inform their provider of the potential exposure.
Health officials have specifically urged people who visited Central Park from this side of the park to be alert, as the park sits adjacent to the outbreak zone.
New York City had a Legionnaires' outbreak in Harlem in 2025 that killed seven people and sickened more than 100. That outbreak was traced to cooling towers at a city-run hospital and the public health lab. The current Upper East Side outbreak has a similar structural origin, but no single source building has been confirmed as of July 20, 2026.
What Doctors and Experts Say
"Legionnaires' disease is a form of pneumonia caused by Legionella bacteria, which grow in warm water and can spread in building cooling systems, hot tubs and showerheads," the CDC explains. The disease is contracted by inhaling tiny droplets of contaminated water vapor, not by drinking tap water, showering in a residence, or using the air conditioning in a home or building not on the positive list.
The disease does not spread person to person. A healthy person sitting next to a Legionnaires' patient in a hospital cannot contract it from them. The only route of infection is inhaling contaminated mist or vapor, almost always from a building's water system.
Antibiotic treatment, particularly fluoroquinolones and macrolides, is effective when administered promptly. City health officials said that early diagnosis and treatment significantly improve outcomes. The 10% case fatality rate cited by the CDC applies to diagnosed cases overall; elderly patients and those with chronic conditions face a higher mortality rate.
What the Evidence Shows and What It Does Not
MedicalDaily Evidence Check
- Outbreak status: Active, as of July 20, 2026; source not yet confirmed
- Confirmed cases: 72 as of Saturday evening, July 19, 2026 (up from 67 earlier in week)
- Deaths: 2 confirmed
- Currently hospitalized: 9
- Previously hospitalized and discharged: Approximately 50
- Bacteria detection: Living or dead Legionella pneumophila found in 76 cooling towers across the Upper East Side and one on the Upper West Side
- Named buildings with positive tests: Guggenheim Museum, Metropolitan Museum of Art; others not officially named but referenced in news reports include private schools and residential buildings
- Source confirmed: No; investigation ongoing
- What it does not show: Which specific building or buildings caused the human infections; whether more cases will emerge from the exposure window
- Remediation status: All 76 positively tested buildings have completed required cleaning and disinfection
- What readers should know: Anyone who visited the Upper East Side since late June should monitor for symptoms for up to 14 days after their most recent visit
Who Faces the Greatest Risk?
The CDC identifies the highest-risk populations for severe Legionnaires' disease as:
- Adults 50 years of age and older
- Current or former cigarette smokers
- People with chronic lung disease, including COPD, emphysema, or asthma
- People with weakened immune systems, including those on immunosuppressant medications, with HIV, or undergoing chemotherapy
- People with diabetes or kidney failure
- Heavy alcohol users
The second victim in this outbreak was described as a healthy man in his 80s with no known underlying conditions, which is a reminder that no demographic is completely protected. However, the risk of fatal outcomes is substantially higher in the groups listed above.
Symptoms and Warning Signs to Watch For
Legionnaires' disease symptoms typically appear 2 to 14 days after exposure. Warning signs include:
- High fever, often above 103 or 104 degrees F
- Cough, which may produce mucus or blood
- Shortness of breath
- Chest pain when breathing
- Headache
- Muscle aches
- Fatigue and general malaise
- Nausea, vomiting, or diarrhea
- Confusion or changes in mental status, particularly in older adults
A milder form of the illness, called Pontiac fever, causes flu-like symptoms without pneumonia and typically resolves without treatment, but it is caused by the same bacteria.
Anyone who has been on the Upper East Side since late June and develops these symptoms, especially high fever combined with respiratory symptoms, should seek medical care immediately and tell their provider about their potential Legionella exposure. Do not wait. This is especially important for people 50 and older or those with underlying conditions.
What You Can Do Now
- If you visited the Upper East Side of Manhattan (ZIP codes 10028, 10128, or 10075) since late June 2026, monitor your health for up to 14 days from your last visit.
- If you develop fever and respiratory symptoms after such a visit, call a health care provider immediately. Tell them you may have been exposed to Legionella.
- If you have a high fever, shortness of breath, or confusion, go to an emergency room and specifically mention potential Legionnaires' exposure.
- Tap water, showering at home, and residential air conditioning in the area are safe. The concern is specifically about cooling tower vapor in or near the named buildings.
- Do not visit the outdoor areas or buildings in the exposure zone if you are in a high-risk group and your visit is not essential.
- Monitor the NYC Department of Health website for daily updates on case counts and investigation progress.
- If you have visited the Guggenheim or Metropolitan Museum of Art since late June and are in a high-risk group, consider contacting your health care provider proactively.
Cost and Access: What Patients Should Know
Legionnaires' disease is diagnosed through urine antigen testing and sputum cultures, which are covered by most insurance plans and Medicare. Treatment with antibiotics is available through urgent care, emergency departments, and primary care providers. For uninsured patients, NYC Health + Hospitals (the city's public hospital network) provides emergency evaluation regardless of insurance or immigration status. Call 311 or visit nyc.gov/health for information on local public health resources.
What Happens Next
The NYC Department of Health is updating case counts daily. Investigators are continuing to attempt to identify the specific building or buildings responsible for the human infections. If and when a source building is confirmed, that information will be released publicly. A legal action has already been initiated on behalf of the second victim's family by attorney Ronald Katter, who has stated he intends to sue the identified source building owner once the investigation concludes. MedicalDaily will update this article as the investigation advances.
The Bottom Line
Two people have died, and 72 are confirmed sick in an active Legionnaires' disease outbreak on Manhattan's Upper East Side. Cooling towers at the Guggenheim Museum, the Metropolitan Museum of Art, and dozens of other buildings tested positive for Legionella bacteria, and all have been ordered to disinfect. Anyone who visited the area since late June should monitor for symptoms for up to 14 days. High fever plus respiratory symptoms following a visit require immediate medical evaluation. If you are 50 or older or have a chronic illness, do not wait.
