Legionella Archives

Legionella Pneumophila Bacteria. 3D illustration

November 11, 2025 zacherlaw 0 Comments

Marshall County Declares Legionnaires’ Outbreak Over — but the Source Remains a Mystery

November 7, 2025 — Marshall County, Iowa After weeks of investigation and dozens of confirmed cases, Marshall County Public Health (MCPH) has officially declared the Legionnaires’ disease outbreak over. But despite extensive testing and cooperation with the Centers for Disease Control and Prevention (CDC), officials say the precise source of the bacteria was never found. The outbreak, which began in early September, sickened 74 people and led to two deaths. Health officials identified 12 business centers in north-central Marshalltown as likely locations where exposure may have occurred — all of which contained cooling towers, a common source of Legionella bacteria.…

November 3, 2025 zacherlaw 0 Comments

Cooling Towers and Data Centers

Why Cooling Towers Are Used in AI-Driven Data Centers—and Why That Matters for Public Health As the world races to harness the power of artificial intelligence, the physical infrastructure behind AI is expanding at an unprecedented rate. Massive data centers—home to the servers powering models like GPT-5—are being built across the country. But with these high-performance computing facilities comes a lesser-known risk: the potential for outbreaks of Legionnaires’ disease due to the use of cooling towers. High Heat, High Stakes: Why Cooling Towers? AI models require enormous computational power. Training a large language model or powering real-time AI tools demands…

September 8, 2025 zacherlaw 0 Comments

The Hunt for a Killer: Manhattan’sLegionnaires’ Outbreak and What It Reveals

“The hunt was on.” That’s how The New York Times iframed the search for thesource of the deadly Legionnaires’ disease outbreak now unfolding in Manhattan.It is an apt metaphor, because when Legionella pneumophila bacteria surface in acity like New York, the chase resembles a high-stakes detective story. The culpritsare invisible, their habitat is hidden, and the cost of delay is measured in lives. A Race Against Time The article describes how health officials, engineers, and epidemiologists havefanned out across Manhattan, scouring cooling towers, plumbing systems, androoftop reservoirs. Their mission: identify the contaminated water system seedingthe outbreak. Each day matters. Legionnaires’…

August 12, 2025 zacherlaw 0 Comments

Legionnaires’ in Harlem: When Public Health Fails the Same Neighborhoods Again and Again

It’s happening again. Another outbreak of Legionnaires’ disease in New York City — this time in central Harlem, where 73 people have fallen ill and three people have died, according to the NYC Department of Health as of August 7, 2025. Officials believe the likely culprit is a cooling tower — those big rooftop structures that help regulate temperature in buildings but can become deadly if they aren’t properly cleaned and maintained. When they’re contaminated with Legionella bacteria, they can spew mist into the air, carrying an invisible, lethal threat into the streets below. But if you’ve followed Legionnaires’ outbreaks…

August 6, 2025 zacherlaw 0 Comments

When the Mist Turns Deadly: A Legionnaires’ Outbreak in Harlem Brings Back Old Warnings

It’s the middle of summer in New York City, and the hum of air conditioners is a familiar soundtrack. But in central Harlem, that sound comes with a warning. As of August 5, at least 58 people have contracted Legionnaires’ disease — and two have died — in an outbreak believed to be tied to a contaminated cooling tower. Again. The city’s health department is testing towers in the area encompassing the zip codes 10027, 10030, 10035, 10037, and 10039, and bordering communities. So far, 11 cooling towers have tested positive for Legionella pneumophila. The city’s health department is urging…

May 5, 2025 zacherlaw 0 Comments

Royal Caribbean and Cruise Lines

According to some news reports, Royal Caribbean has issued a health alert to guests after a case of Legionnaires’ disease was potentially linked to its popular vessel, Symphony of the Seas. The guest sailed during March or April 2025. Although the Centers for Disease Control and Prevention (CDC) has not confirmed the ship as the source of exposure, the company has adopted precautionary measures, citing an “abundance of caution. This is not the first time Symphony of the Seas has been associated with potential cases. In January 2025, Royal Caribbean sent notices to passengers after two other guests were diagnosed…

June 27, 2023 zacherlaw 0 Comments

Legionella bacteria has been found in the KetteringFairmount High School Field House

According to news reports, the Legionella bacteria has been found in the KetteringFairmount High School Field House in Montgomery County Ohio. The testing forLegionella at the Field House was done after 36 athletes became ill. These athleteswere tested and the results are not yet available. June 13, 2023 was the lastreported case of Legionnaires’ disease in the county. There has been a total of 12cases reported across the county in 2023..

May 18, 2023 zacherlaw 0 Comments

Illinois LA Fitness Site linked to Two Cases of Legionnaires’ Disease

An LA Fitness site in Niles, Illinois has been linked to two cases of Legionnaires’ disease according to the Illinois Department of Health. Again, according to the Illinois Department of Health, the Legionella bacteria had been found in the hot tub at the LA Fitness location. According to one user of the gym, many of the members are over 50 years of age. These members are more susceptible to acquiring the disease. If you would like more information about Legionnaires Disease click here. If you suspect you may have contracted or have been diagnosed with Legionnaires’ Disease, Contact Attorney Jules…

November 8, 2021 zacherlaw 0 Comments

Legionella Bacteria Found at Fort Sam Houston Barracks

Staff at Joint Base San Antonio-Fort Sam Houston (JBSA) in San Antonio, Texas, discovered Legionella bacteria during routine water testing. More than 80 residents and staff at Liberty Barracks are being relocated to other barracks and dorms across the base. There are no reported cases of Legionnaires’ disease so far. The relocated service members are from the Brooke Army Medical Center’s Soldier Recovery Unit. This unit includes the Behavioral Health Clinic. The building will be treated and retested after 72 hours. JBSA’s early discovery of the bacteria, before any reported cases, highlights the importance of routine testing for Legionella bacteria. To read more about…

October 30, 2021 zacherlaw 0 Comments

High Levels of Legionella Found Aboard Washington State Ferries Fleet

Several ferries operated by Washington State Ferries (WSF) have tested positive for high levels of Legionella bacteria. WSF discovered the bacteria after conducting water tests in the galleys and water fountains. Due to shutdowns stemming from the COVID-19 pandemic, water aboard the ships remained stagnant for over a year. Water stagnation may lead to bacteria growth, including Legionella. WSF’s discovery highlights the importance of businesses being proactive in their efforts to protect the public from Legionnaires’ disease. WSF, as well as other business, can flush out the affected water systems and treat them with disinfectants that will kill the Legionella bacteria and protect passengers…